1. Which of the following statements is true?

a. The two balls are moving at constant speed.
b. Neither ball is moving at constant speed.
c. Only ball A is moving at constant speed.
d. Only ball B is moving at constant speed.

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3. The diagrams below show different trials that Mary carried out with carts carrying 0, 1, and 2 blocks. The blocks were of equal mass, the length of the ramp was the same in all trials and she always released the cart at the top of the cart.

She wants to test the hypothesis that the heavier the cart the greater its speed at the bottom of the ramp, which three trials should she compare?

a. T, X, and Y
b. X, Y, and Z
c. R, Y, and Z
d. R, S, and T

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4. The drawing shows an apple falling on the ground. In which of the three positions does gravity act on the apple?*

a. In position 2 only
b. In positions 1 and 2 only
c. In positions 1 and 3 only
d. In positions 1, 2, and 3

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5. A ball is released from a certain height h. After it hits the floor it bounces back to half of the height from which it was released. This is because

a. During its collision with the floor, the floor exerted on the ball a force smaller than the force the ball exerted on the floor.
b. The momentum of the ball-earth system is not conserved furing the collision.
c. Some of the mechanical energy was converted into heat during the collision.
d. Some energy was converted into momentum in the collision.

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* This question was taken from the Third International Mathematics and Science Study (TIMSS).