Series-A02 is for submission by Midnight on the 2nd Sunday in October, if possible.
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1. A crate is sitting in the center of a flatbed truck. The truck accelerates to the right, and the crate moves with it, not sliding at all. What is the direction of the frictional force exerted by the truck on the crate?
To the left To the right. No frictional force because the crate isn't sliding.
2. Three identical balls are thrown from the top of a building, all with the same initial speed. The first is thrown horizontally, the second at some angle above the horizontal, and the third at some angle below the horizontal. Neglecting air resistance, rank the speeds of the balls at the instant each hits the ground.
Ball 3 is faster than 1 is faster than 2. Ball 2 is faster than 1 is faster than 3. Ball 1 is faster than 2 is faster than 3. Ball 3 is faster than 2 is faster than 1. All balls have the same speed on impact.
3. Two highly-elastic superballs, the first much larger than the second, are dropped in rapid succession from a point one meter high. When the first superball collides on the rebound, with the second superball still on its way down, the second superball has enough kinetic energy to rebound to what height?
1 meter. 2 meters. 4 meters. 9 meters. 16 meters.
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