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Mechanics





Collisions 1

One ball strikes another of equal mass. What will happen?
Why? 
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Collisions 2

1 ball hits many of equal mass. What will happen? Why does
only 1 ball emerge? 
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Collisions 3

Now there are two balls incoming. 
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Collisions 4

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? 
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Torque 1

How does this distance from the support affect the number
of masses needed to achieve balance? 
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Torque 2

Which is important: the vertical distance, the horizontal
distance, or the total distance from the support? 
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Angular momentum

What happens when a skater in a spin brings his arms in? 
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Angular momentum 2

The wheel only allows rotation about the vertical axis, so
the vertical component of angular momentum is conserved. 
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Angular momentum 3

What if the wheel is initially spinning horizontally? 
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Vector angular momentum and vector torque vector nature

Why does the wheel not fall down? 
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Fluids





Curve ball

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. 
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Ball in air stream

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? 
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Picking up a ball with compressed air

Compressed air is blowing out of the funnel, so what
is keeping the ping pong ball in? 
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Electricity and Magnetism





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. 
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