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Summer Fun for Students

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I was recently asked by a student what kind of fun (but serious) science-y play he could do over the summer. He is bored, stuck at home, his summer camp experience having been unexpectedly canceled. This is a student who repeatedly did that little bit extra in physics class all year (he even completed the first two chapters of “SpaceTime Physics” by Taylor and Wheeler) . He is signed up for second year (calculus-based) physics next year. Thus he is going to be learning VPython over the summer anyway. And he will be doing video analysis as part of his physics class next year. So take a look at what I suggested to him, and let me know if there is more that I could suggest.

  1. Read The Talent Code by Daniel Coyle (ok, I tell everyone this).
  2. Get your parents to use that cash they saved on summer camp to buy a student license for Mathematica and start playing with it (I know his parents can afford this and I know that he already has the math chops and curiosity to make it worthwhile).
  3. Get started early on VPython and then dig a little deeper into lists, loops and conditional statements in Python.
  4. Go to and use Mathematica and/or Python to solve some problems.
  5. Buy an Arduino starter kit and start making your computer control something.
  6. Download Tracker and make it work with the sample files.
  7. Try to create a document using LaTeX.
Now there are things in here which build skills that are not necessary for high school or even college, and there is more than a kid could possibly do. I figure that if he does one or two of these things, he’ll stay out of trouble and be excited for at least part of the day (and play a video game or two fewer each day). Some of these items are things that students in the past have gotten a kick out of doing on their own (well, a certain type of student to be sure).
Further suggestions for the home-bound future scientist?

Written by Mark Hammond

2011/07/05 at 10:01

Posted in deep practice, mindset

Spend Time, Dig Deep, Think Hard

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“… spend time, dig deep and think hard…” These are words I used in a response to Rick Fletcher’s comment to my last blog post. We had a little back and forth on when videos seemed to help propel student learning. Then it hit me. I have been asking questions about how and when my students engage in deep practice, and “spend time, dig deep and think hard” perfectly describes deep practice. Maybe all is not lost and I do have some tricks up my sleeve that promote deep practice with my students.

Deep practice in the swimming pool is a bit easier to arrange, and I think that this is what frustrates me. We get out the snorkels and devise drills to isolate head, hand and body position. We use the power rack, power tower and speed assist training to isolate explosive motions. We do lots of threshold work and maxVO2 work every week. And we kick, pull with paddles and swim with flippers, isolating specific sub-skills. We film the kids and post the individual videos (with commentary) that they can watch the very same evening they were videoed. The new swimmers get daily stroke work for most of the practice, with one coach totally dedicated to that lane.

I try to immerse my students in deep practice during class, first so that I can watch them (just like I watch my swimmers), second so that I can give feedback quickly, and third so that I can more carefully design exactly how the time is spent. This deep practice consists of doing experiments, solving large problems in small groups and verbally defending their ideas. Several years ago, homework was where I expected my students to put in all of their hardest practice. Now my students’ evenings are a mix of some necessary (but not too strenuous) skill-building and lots of (very strenuous) self-directed practice and remediation. Evening self-directed practice is necessary because I use standards-based grading, and students are required to address missing learning objectives after our initial formative assessments. And it is this particular practice that worries me.

I suspect that my students’ self-directed practice might not reach the level of useful, deep practice for two reasons. First, I see very uneven results. The proof is in the pudding, right? If the kids aren’t getting better very quickly, then the practice is ineffective for some reason (too little time spent? wrong things being done?). Second, I don’t feel that I am giving them enough good ideas for how to engage in deep practice. I’ve just realized that the videos that I have made for my students are being used by at least a few of the students for deep practice, while my original goal was just to give them a little more help.

From my last post, remember that I make one type of video that isolates small, mechanistic skills. When I hear from a senior who has had vectors in math class for three years tell me that she watched my 4 minute “how to move a vector so that you can subtract vectors graphically” video more times than she could count (and subsequently finally understands what vectors are and how to manipulate them), I hear deep, repetitive practice of an isolated sub-skill.

I also make videos where I solve some big bear of a problem where I talk my way through my thought process, starting from models and fundamental principles. When I overhear two sophomores talking about how many times they had to watch that video before they found the one glitch in their thought process that was keeping them from truly understanding conservation of momentum, I am hearing a description of deep practice.

So here was my initial misconception about these videos: I thought that students would use these videos once and learn something. Yet I never hear any of my students say “I watched that video, now I understand.” They might get enough from one viewing to go back on their own, dig deep and think hard, so I don’t think a single viewing is necessarily worthless. Some of my students may only need this kind of small boost. But it is the students who spent time, dug deep and studied the videos who really got a lot out of the videos. And I really think this works because it is their teacher (someone they have a connection with, someone who is connecting their daily experience in the classroom to the subject of the video) who is making the video. A one-size fits all video from someone who has never attended my class probably wouldn’t inspire the same kind of hard work and time spent.

Written by Mark Hammond

2011/06/20 at 09:29

Using Videos to Help Learners

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The media attention garnered by Khan Academy has inspired considerable debate about the efficacy of using videos to help learners.  Some have taken criticism of Khan’s videos (such as this well-reasoned piece from Frank Noschese) as equal to saying videos are incapable of helping students learn. Sal Khan has personally commented on the subject, and at one point challenges others to post better videos. He also gets a little testy later on in the comments, suggesting directly that his critics think video is useless as a learning medium. Yet I think it’s what happens in the video that is important. The fact that video is the medium is quite secondary. The secondary nature of the medium is totally lost on most of the fawning press Khan Academy gets. “It’s video! OMG! It’s a revolution!” Yes. Gag.

I think video can be useful for helping learners. I’d like to set forth here how, when and why I use video (or want to use it more… I’m pretty new at this).

Individualized feedback:

I mark up student work like everybody else. That is, I give written feedback. I am often unsatisfied with my own written feedback, because 1) my writing is messy, 2) the page gets crowded, 3) I am too impatient to fully explain what the student is missing and 4) I suspect my written feedback is often not studied by my students. An alternative that I have used is to write only very limited feedback, scan the student work, then make a quick screencast, pointing at the mistake on the scanned document with my voice-over expounding on what has gone wrong. I can even ask questions of the student, rather than just give the correct answer.

Why do all this when my students and I live nearly on top of each other? The reason is I can quickly knock out four or five short screencasts in the evening before bed or in the morning before class in about the same time it would take to set up a series of short conversations with the kids. And the students tend to watch the videos and then ask really good questions later. These videos do not replace the student-teacher interaction, they make it simpler and often make it deeper when the face-to-face happens.

Mechanistic Instructions:

I make short videos showing how to do things like redrawing a vector with its tail on the tail of another vector, reproducing the magnitude and direction accurately using a protractor. Simple, right? Anyone should be able to do that. At least that’s what I thought until I realized many students were flailing around, unable to translate words and still pictures into action. I’m getting ready to make a video showing students how to use a scale on the page to measure the magnitude of a vector. And how to use a protractor correctly. These are all things that I want my students to be able to do on the summer homework I just sent them. Without the videos, I know that I get a lot more confusion and less learning, just because some very simple steps have not been explained. Sure most would figure it out by themselves, and most actually will! This is a back-up plan for the minority that need it.

How are these videos different from Khan Academy videos? They are different because they closely match the way I want to teach vectors. They are not designed to give any deeper understanding about vectors, they are designed to address small steps that are fairly mechanical in nature. The videos are customized to my style to a degree that a video made for millions can’t be. And the subject matter is chosen to address small problems that I know students will have, based on my in-class experience.

Once this past year, a student had a problem that I didn’t have time to address. She had forgotten how to use scientific notation and this was holding her back. She had learned scientific notation before, but was rusty. I sent her to Khan Academy (even though I cringed a bit at the way negative exponents were explained). Here is what I consider a legitimate use of Khan Academy videos: the student already knows the content, but needs a refresher. If the student were learning scientific notation for the first time, I would not want to present the algorithmic approach that Khan uses (even though he claims to “explain the why,” I find most of his videos very much “do this, then do that” algorithms with little meaning), but for my student who needed a quick refresher, this was the quickest way for her to get it. If I had an extra thirty minutes that day (and they coincided with her extra thirty minutes), a live session with me would have been better, but we got the job done with the help of Sal Khan.


Occasionally I make a longer video (or pen-cast) that shows me walking through a tough problem. I do this so the students have a model of solid problem-solving that they can review as many times as they want. I emphasize that just watching a video (or a live lecture) of a problem being solved by someone else will not result in understanding. But the video gives the students a way of getting immediate feedback when I’m not around. This is how we achieve deep practice if I’m not actually in the same room as them.

Can Khan Academy provide this kind of video? I guess it could, but it doesn’t. Maybe it can’t. My problem-solving videos may only work for students who start their solutions from fundamental principles and then move to a determination of what models apply. Other teachers use different approaches… I wouldn’t suggest students outside my school would get a great deal from my videos. Maybe they could, but I won’t insist they could. My students get to where they can understand my videos by developing their own understanding in the lab. If a student went from Sal Khan’s kinematics lectures to my problem-solving videos, I’m pretty sure they would be confused.

Flipping the Classroom:

More on this later, but I haven’t figured out how to do the flipped classroom all that often. I use Modeling Instruction, where the students are already doing in class what proponents of the flipped classroom are advocating. The uses of video mentioned above do save some class time, but it’s not as if I’m giving video homework every night. Or even once a week. I think of using video as a way to be more efficient. Maybe there’s more… I’ll work on it. I am gradually using video more and more, though.

Do you have more ways of using video? Leave a comment!

Written by Mark Hammond

2011/06/11 at 12:25

Leading with mistakes

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There has been some internet-based discussion recently amongst math and science teachers about the usefulness of Khan Academy videos in particular, and lecture videos in general. Derek Muller at has created a short video about his research findings into the efficacy of using videos to teach introductory physics concepts. If you watch that quick video, you’ll get a snapshot of one thread of the recent discussion. The upshot of Derek’s argument is that videos which contain student misconceptions and show real people working with and through their misconceptions lead to more successful learning by the observer of the video than does a straightforward exposition of the proper concept.

A recent blog post by John Burk at quantumprogress discusses the idea of using video examples of problem solutions that include common student mistakes and/or misconceptions. The idea is for the students to identify the mistakes made, thereby potentially learning more than if they simply ceded control to the expert on the screen solving the problem. We’ve all seen the effect of students watching an expert solve a problem for them. The students watch the solution unfold before them, usually failing to notice the subtle (albeit clearly presented) steps that cite fundamental principles and call out the broad models or chunks of knowledge that lead the expert to appropriately set up the problem (they just see the problem set itself up). Then they are bewildered at the prospect of starting a problem themselves.

In the comments to John’s blog post, there are some fantastic observations. One is from Jim Doherty who mentions the possibility of giving a correct and incorrect solution to the problem, having the students select the correct one and explain the mistake in the incorrect one. He also mentions a device used by a colleague, whereby a troubled student (“Careless Carl”) appears in problems, making common mistakes. Joss Ives wonders in the comments whether such devices might lead to student frustration on a level that leads them to give up. I’d like to address 1) how I use Careless Carl and 2) how I avoid the “oh crap, I just agreed with this idiot, which means I’m an idiot, too, so I quit” syndrome.

Careless Carl makes appearances in my class all the time, as John Burk knows. He went by the name Bobo (what a clown) when John and I taught together, but now Kelly O’Shea has given him the name Throckmorton (apologies to the Throckmortons of Fort Worth/Dallas, Texas). Throcky (who is your cousin) is a bit more advanced than Bobo… what he says is often ALMOST correct, containing lots of good reasoning with some crucial boneheaded blunder buried deep inside. Sometimes students reluctantly agree with Throcky, dropping their head, wincing, knowing that they are in less than stellar company. But they generally don’t “throw their hands up in the air in defeat,” as Joss worries.

Here’s why: My students have a very strong conception of their scientific self as something that is fluid and ever-changing. They have this conception because we talk about it! Not for long periods of time, but it comes up at least once a week. They have heard again and again that what they know to be true about the world now will, undoubtedly, change as they become wiser, more skilled, more observant and more careful. In this way, they are just like established, expert, working scientists. Scientists expect their view of the world to change and evolve as they understand more about it.

Many of my students, when faced with their own mistake, will say something like “Ok, that was my eighth grade science self. Let’s see what’s wrong.” In fact, “eighth grade self” has become a very popular phrase this year (although last year my students preferred to blame Aristotle, rightly or wrongly, for everything). This just happened yesterday, in the same way, in both of my Honors classes. We are about three days into studying the central force particle model (uniform circular motion). In each class, someone spoke up asking “Wait… if the speed is constant, how is there a net force on the object?” I asked what principle or model the student was applying and in both cases the answer was something like “My gut.” They know by now that their gut is not any better at physics than Throcky. The class then puzzled out the answer. About half knew right away what the mistake was, but, because they are extraordinarily kind and gentle, didn’t say anything until the answer emerged naturally from those having what they called an “eighth grade moment.” It was beautiful, mainly because the students expect this to happen.

I’m not saying none of my students get frustrated. I had a minor meltdown (including tears) to deal with after dinner two nights ago. But the student was much better when he realized that, even though he hadn’t truly learned how to use vectors to do momentum problems yet (even after three months), he had learned something very valuable about what kind of practice doesn’t work. And his assumption is that tomorrow he will understand more about momentum and vectors than he does today.

If there is one thing middle school teachers could instill in students that would help them the most in high school, it is the idea that their own conceptions of the world are bound to change. They should seek out the opportunities to change these conceptions and celebrate the replacement of old concepts with new. I have seen this trait in some students (locally, the Newark Center for Creative Learning teaches this habit fantastically), so I know it is possible to do. This makes students much happier and eager learners.

Written by Mark Hammond

2011/03/26 at 09:50

Posted in deep practice, mindset

Deliberate Practice in Physics

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I have been trying to figure out the ways my colleague, Kelly, and I get our students to engage in deep practice (Daniel Coyle’s term) or deliberate practice (Geoff Colvin’s term) in the classroom and on their own when studying physics. This article by Stephen Chew nicely outlines the problems incoming college students have with mindset and study skills, arguing that they often lack the knowledge of what serious study looks like or feels like. While the work I’m trying to do with my students should definitely prepare them for studying in college, my more proximal concern is getting them to learn physics. I’m admittedly making an assumption that getting them to study in a more serious, deep and productive way in order to learn physics should serve them well in college, too.

Colvin’s book (Talent is Overrated) outlines some of the hallmarks of deep practice.

It is an activity designed specifically to improve performance, often with a teacher’s help; it can be repeated a lot; feedback on results is continuously available; it’s highly demanding mentally, whether the activity is purely intellectual, such as chess or business-related activities, or heavily physical, such as sports; and it isn’t much fun.

So what is it we actually do, as teachers, to improve performance?

Kelly and I do a lot of small group problem-solving sessions using whiteboards. Essentially the students do in the classroom what they used to do for homework. The reason I want them to use class time as practice time is that I can see exactly what is going on. In-class problem-solving also allows “continuously available feedback.” I started using class time as practice time after taking a course in Modeling Instruction, but my misgivings about homework started much earlier after deliberately watching students do homework (I work at a boarding school, so I am privileged to be able to witness this… in exchange for working a 15 hour day).

We have students present their work verbally. Talking one’s way through a thought process is fantastic practice. I need my students to do even more of this.

We let students, after plenty of scaffolding early in the year, design their experiments in the laboratory. Early in the year we give them a structure for designing an experiment (roughly: make and record initial observations, use that list of observations to decide what you can measure and how to measure it, pare that list down to what might be related and/or interesting to the phenomenon at hand, then decide what variables to hold constant, which to vary, and what you are going to plot), and we step through this structure, little by little handing off elements to the kids until they can design their own experiment with only a bit of coaching.

But what do we have students do that is “specifically designed to improve performance” when they aren’t with us. I don’t want to create students who depend on me being present in order to do physics. This makes me worried. How do I come up with something new, and does it really work? What evidence do I have? Is it working, but not yet? Does it seem to work, but then not lead to deep understanding that sticks? These are questions that bother me, leading me to stall while planning classes, my perfectionism becoming my procrastination tool of choice again, just like in college. Ok, I’m better than I was in college, but still… I don’t have good answers to these questions.

One hallmark of repetitious skills building is that the performance being worked on is altered in some way, and this is a possible solution to the problem of deliberate, solitary study. Problems are given with partial information, wind sprints are run uphill (even though the lacrosse field is flat), swimmers sprint tethered either to impeded them (the power rack) or to assist them (speed assist training), students create problems rather than just solve problems given them. The trouble is, I feel I can come up with many more ways we focus on performance in swimming (next post, I swear) than we do in the physics classroom. Maybe it isn’t true, but it’s a nagging concern. I’d love ideas about how others see themselves helping students toward deliberate practice.

Written by Mark Hammond

2011/03/19 at 10:03

Posted in deep practice, mindset

Why do we think sports are important?

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At my school, all students are required to be in an afternoon activity every afternoon for the entire year. Most afternoon activities are sports-related: either participating on a team, helping manage a team, or doing an independent sports workout (crew winter workout, training for a marathon, etc. usually reserved for upperclassmen). Theatre, organic gardening, mock trial, and non-athletic individual projects (usually only seniors) are other options. So why do we demand that most students spend 1.5 to 2 hours each and every day on a sport?

Typical answers include: teaching teamwork, teaching students to be part of something bigger than themselves, teaching character, teaching lifelong fitness skills… you probably know a couple more reasons. All of these are good reasons, and I won’t knock them. Sports are also fun!

But I think that the most important lesson I learned from swimming as a youngster was that I could become good… actually pretty darn good… at something if I really worked hard at it.

How I learned that hard work makes a difference

I was not a “naturally talented swimmer.” As a pre-teen, I was roughly spherical (perhaps foreshadowing my own predilection for creating simplified physical models). I also had terrible eyesight. My myopia was severe and ever-changing. Within a month of getting new glasses, baseballs again appeared as fuzzy white things with totally unpredictable paths. During neighborhood football games (“hey! I can see THAT ball!”), I always heard “Hammond, you hike the ball and go long.” I went long… totally, but futilely, open in the endzone… beyond the endzone, risking my life by crossing the drive into LeBaron Caruther’s front yard (not that LeBaron was a bully… he wasn’t… but Google him and see what he was really good at, and then realize that in high school he used his parent’s front yard for LOTS of deliberate practice).

In the pool, my poor eyesight didn’t bother me. I was also rather floaty at that age (being roughly spherical and all). Yet I was slow. Very slow.  There were two boys I swam with who looked, at age 10, like miniature men… washboard abs, bulging arms and thighs… and they were both ranked in the top ten nationally in our age group. They were so-called natural swimmers. Everyone agreed that they had talent. Me, not so much. But I was a good egg, a hard worker, and several wonderful coaches encouraged me anyway. Within a year, in summer league competition, I could beat those neighborhood kids who wouldn’t throw the football my way. Within two years, I was working out with my naturally talented, svelte and muscled acquaintances, and giving them some tough workout competition. In fact, I was a maniac during workouts. I remember Bobbie L., a year my senior and a state record holder, looking back at me in puzzlement asking “how the ___ are you keeping up with me?” Still, in competition, these boys could easily defeat me. It was only after four years that I could compete reasonably with them at championship meets. The vibe was ever positive and I thrived.

What I learned from swimming

My swimming experience had given me a valuable advantage: I was in possession of a growth mindset… at least some of the time. Unfortunately this mindset did not extend to academics until I was in college (frankly it didn’t occur to me until that point that I could transfer my knowledge from the pool to the desk… just ask my high school Latin teacher). As my swimming buddies and I became high schoolers, I started to surpass them… not always, but often enough. They were no longer nationally ranked. They were, as I knew from daily contact in the pool, not working as hard as I was. And their talent, whatever that was, was not enough to see them through to a NCAA Division I experience. I suspect that they felt their talent had been exhausted at some point around 14 years old. They weren’t as good as they had been told. If you’ve reached your potential, why kill yourself trying to improve any further?

Pretty soon in college, I decided the time I was putting into swimming was probably better spent elsewhere (and eventually I settled on intellectual pursuits after a short detour, but we’ll just pretend that didn’t happen). I still swam, but not passionately, and not with the same commitment as before, partly due to a series of injuries, but mostly due to burgeoning intellectual curiosity. But the lessons learned from swimming… that hard work pays off, that you don’t have to be good at something right away, that improvement feels good… stuck with me. These are the lessons that I seek to convey to the athletes with whose education I am charged. The fact that many of our students play three different sports, often being fairly good already at one or two and stinking it up in the other, gives them ample opportunity to see growth and change in their performances.

Nevertheless, I find it strange that it didn’t occur to me that, although my friends’ talent didn’t carry the day, perhaps the whole idea of talent was flawed.

Later on, I’ll write about what I learned about deep practice (deliberate practice) from swimming. Interestingly, my own swimming career involved very little deep practice, but I saw it, it puzzled me and only years later did I figure out what I had been looking at. Later, though.

Written by Mark Hammond

2011/03/16 at 21:05