121 Winter 2019, #2

Please read carefully and answer properly

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* 1. In order to receive credit, we need your name

First Name

Last Name

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The next three questions refer to a coin which is tossed straight up into the air. After it is released it moves upward, reaches its highest point and falls back down again. Use one of the following choices (A through G) to indicate the force acting on the coin for each of the cases described below. Answer choice J if you think that none is correct. Ignore any effects of air resistance.

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* 2. The coin is moving upward after it is released.

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* 3. The coin is at its highest point.

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* 4. The coin is moving downward.

The questions below refer to collisions between a car and truck. For each description of a collision, choose the one answer from the possibilities (A though D) that best describes the forces between the car and the truck. Compared to the force that the truck exerts on the car, the force that the car exerts on the truck is:
A) Greater
B) Smaller
C) The same
D) Not enough information is given.

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Truck is much heavier than the car

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* 5. They are both moving at the same speed when they collide. Which choice describes the forces?

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* 6. The car is moving much faster than the heavier truck when they collide. Which choice describes the forces?