Four choices are available for each video:
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RealVideo, streaming. This should be the choice of most modem users. You can begin watching the video in seconds. |
RealVideo download. This is a very high quality RealVideo format. If you configure your RealPlayer for the highest speed connection, the quality of this is quite nice. |
| MPG streaming. Best choice for on the WFU campus. (Sorry, but bandwidth limitations mean that off-campus users cannot view this format.) | MPG download. The best quality but the largest file. |
Note that only those on the WFU campus can access streaming MPG, because of bandwidth limitations.
| Demo | Discussion |
Streaming |
Download |
Demo |
Mechanics |
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Collisions 1
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One ball strikes another of equal mass. What will happen? Why? | |||
Collisions 2
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1 ball hits many of equal mass. What will happen? Why does only 1 ball emerge? | |||
Collisions 3
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Now there are two balls incoming. | |||
Collisions 4
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All but two balls are incoming, striking two balls at rest. | |||
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Tennis and basketball bounce |
Why does the tennis ball fly so high? | |||
Torque 1
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How does this distance from the support affect the number of masses needed to achieve balance? | |||
Torque 2
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Which is important: the vertical distance, the horizontal distance, or the total distance from the support? | |||
Angular momentum
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What happens when a skater in a spin brings his arms in? | |||
Angular momentum 2
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The wheel only allows rotation about the vertical axis, so the vertical component of angular momentum is conserved. | |||
Angular momentum 3
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What if the wheel is initially spinning horizontally? | |||
Vector angular momentum and vector torque vector nature
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Why does the wheel not fall down? | |||
Fluids |
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Curve ball
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A curve ball illustrates Bernoulli's Principle. The ball is thrown with side spin. As seen from above, the ball spins clockwise. Which way will it break. | |||
Ball in air stream
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Balancing a ping pong ball on a stream of air is easy. Why is this a point of stable equilibrium, that is, why does the ball stay in the center of the air stream? | |||
Picking up a ball with compressed air
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Compressed air is blowing out of the funnel, so what is keeping the ping pong ball in? | |||
Electricity and Magnetism |
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Van de Graff |
Static electricity. The small ball is grounded. Notice what happens when a grounded ice pick is brought near? | |||
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Tesla coil and electric fields |
The fluorescent bulb glows without any wires connecting it. | |||
