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  • beaumartin wrote a new blog post: Space cats Gravity   2 years, 6 months ago · View

    ThumbnailUsing a simple spreasheet, I’ve found how the force of gravity on the balloon changes over time. The gravitational force changes because the balloon moves farther and farther away from the earth. If you look at the formula for Gravitational force, you’ll notice that little R squared on the bottom. This is the distance between the [...]

  • kerriegreene wrote a new blog post: BILLIARDS   2 years, 6 months ago · View

    I am having to stop this capstone early unfortunately. I am afraid I have run out of time. I feel like I have done good work on this just I have stopped short on the fine tuning.

    Now I am off to preparing for my Exam!

  • admin commented on the blog post Sports Science Ray Lewis Capstone Revised   2 years, 6 months ago · View

    Alex,
    This is an improvement over your previous work. You’ve done a good job of checking sports science. To be fully complete however, you need to show me how you calculated the various velocities—you can include screenshots from your work with tracker.

  • admin commented on the blog post Space Cats — Moving on   2 years, 6 months ago · View

    Beau,
    Nice work. How different is the gravitational force on the balloon when it is launched vs when it gets to maximum height? Explain this and we’ll say this is complete.

  • admin commented on the blog post Analysis of white bird in “Angry Birds”   2 years, 6 months ago · View

    Henry, This is excellent. One thing I’m particularly curious about is how you determined the velocity of the egg. Did you find the velocity right after it fell only using a couple of points, or did you use a bunch of points and find some sort of average velocity? Which do you think would be [...]

  • admin commented on the blog post Conservation of Angular Momentum (Fan Experiment)   2 years, 6 months ago · View

    Saul, I think first question was unclear. Let me try again. Your experiment is very similar to something like a cannon, mounted to a rail car, launching a cannon ball backward. The initial momentum was zero, and aftwerward, the cannonball and rail car have opposite momenta. Similarly, the fan and coat hanger in your experiment [...]

  • saulforman commented on the blog post Conservation of Angular Momentum (Fan Experiment)   2 years, 6 months ago · View

    Angular momentum is the mass of the object times the angular velocity times the radius. Angular velocity would be the rate of change of angular displacement of an object. It could be measured by the fraction of the circumference of the circle that encompasses the distance traveled divided by the time it takes to travel [...]

  • admin commented on the blog post Capstone # 3 Momentum: REVISION 4   2 years, 6 months ago · View

    this is done.

  • admin commented on the blog post 6 Flags Capstone: REVISION 3   2 years, 6 months ago · View

    Also, I see that it my my error in my previous comment that said the velocity was 65 m/s. I’m sorry about that. I was typing too fast. The actual maximum velocity in m/s is 29 m/s. Again, I think you should be able to fix your graph with just a few minutes of work.

  • admin commented on the blog post 6 Flags Capstone: REVISION 3   2 years, 6 months ago · View

    Sarah, I think you’ve got some physics problems in your analysis/graph you still need to resolve. The maximum velocity of the ride is 65 mi/h, not m/s. This is why the value you got for the distance the ride falls is way too high (225 m is taller than anything in the park). Also, I [...]

  • admin commented on the blog post Accounting for the velocity of the camera   2 years, 6 months ago · View

    Noah, It would be very hard for a reader not familiar with your work to understand at all what you are doing here. Can you add explanations, 1-2 sentences to each calculation so that someone can understand your work? Also, now that you have an impulse, you should estimate a time for the collision (does [...]

  • admin commented on the blog post EGG DROP CAPSTONE   2 years, 6 months ago · View

    Excellent work. This is finished. But I wonder what force is required to break an egg?

  • admin commented on the blog post Roller Coaster Capstone #4   2 years, 6 months ago · View

    Naman,
    Nice work. This is complete. Feel free to test it with the loop in our classroom.

  • sarahrichard wrote a new blog post: 6 Flags Capstone: REVISION 3   2 years, 6 months ago · View

    For my next Capstone, I decided to use some of the data I took at 6 Flags. I wanted to find out all I could about the ride Acrophobia, without actually having ridden it. To do so, I used the  iPhone app Theodolite. I found that the first angle of elevation was 50  degrees, and when I stepped [...]

  • sarahrichard wrote a new blog post: Capstone # 3 Momentum: REVISION 4   2 years, 6 months ago · View

    Thumbnail 

    For my next capstone, I will be creating a contraption that will successfully catch a naked (raw, nothing attached to it) egg without breaking it. The materials I plan to use are several of the following: foam, cloth,  packing peanuts , elastic. I will conduct several tests with the materials and see which material(s) cushion the egg  best, [...]
  • kerriegreene wrote a new blog post: Graphs for White Ball   2 years, 6 months ago · View

    ThumbnailThe Vxi is the highest point on the graph. The Vyi is the lowest point on the graph. The vxf and vyf are the points that follow.

  • kerriegreene wrote a new blog post: Graphs for Brown ball   2 years, 6 months ago · View

    ThumbnailThe Vxi and Vyi are 0 because the ball starts at rest.

    The Vxf and Vyf are highlighted on the graphs.

  • beaumartin wrote a new blog post: Space Cats — Moving on   2 years, 6 months ago · View

    Well someone beat me to it. They solved for the ascent rate. Mad props to them because it would’ve taken me much longer. http://www.wired.com/wiredscience/2012/05/angular-size-and-the-height-of-a-space-balloon/ Now lets see If our data lines up with the data of the launch. The wired article puts the velocities around 3.2 and 4.5 m/s^2. If we make that into a [...]

  • admin commented on the blog post Capstone #3 Momentum: REVISION 3   2 years, 6 months ago · View

    I think your are basically done. But I think you’ve got a bit of misunderstanding about impulse. You’ve calculated the speed right before it hits the pillow. Now you need to calculate the change in momentum to bring it to rest. This is the impulse that the catcher must provide. You are right that impulse [...]

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