1. A barge containing 100 tons of coal (100,000 Kg) is travelling at 2 meters per second. The dock is 100 meters away, and so the barge will need to come to a stop within 100 seconds. How large a force does the tugboat need to exert to accomplish this (we will assume that the water resistance isn't helping at all).
2 Newtons      20 Newtons      200 Newtons      2000 Newtons     
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2. A 0.20 Kg tennis ball traveling at 15 meters/second encounters a tennis racquet, that causes the velocity to change to 10 meters/second in the opposite direction, in a time interval of 0.01 seconds. What force did the racquet exert on the ball?
2 Newtons      200 Newtons      300 Newtons      500 Newtons     
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3. Discussion question: Alice threw an orange straight up. After it left her hand, when was the acceleration the largest?
Just after it left her hand (position A)     
At the highest point (position B)     
Just before it hit the floor (position C)     
It was the same at all times     
In addition to choosing one of these, explain your choice, making some reference to the Law of Force and Acceleration.

4. Discussion question: Discuss the forces that are exerted on you as your car does various things: starting to move, stopping for a stop light, running into a brick wall (of course, whatever motions the car makes, you make, too). Estimate the size of the forces (How many newtons?).

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