1. A hockey puck is sitting on an infinitely long ice rink. A hockey player gives the puck a strong whack with his hockey stick and the puck begins moving. Assuming the ice has no friction, what is the property of the puck that keeps it moving? Is there a net force acting on the puck once it reaches a constant speed?

2. Which has greater inertia: a pickup truck (1000 kg) or a motorcycle (250 kg)? Why?

3. Students are engaged in a game of tug-of-war. The total force pulling from the left is 1325 N. The total force from the right is 1250 N. What is the net force and in what direction?

4. If the frequency of a pendulum is decreased by a factor of 3, what will happen to the period of the pendulum? If frequency decreases, then period will increase. Specifically, the period will increase by a factor of 3.

5. What is the acceleration of a mouse that starts at rest and reaches a maximum speed of 2 meters/second in 4 seconds?

6. A projectile is fired at an angle of 45 degrees and an initial velocity of 35 m/s. How long does the projectile remain in the air? Assume initial and final heights are both zero.

7. Using your answer from #8, how far does the projectile travel?

8. A tennis ball is dropped from the top of a building on Earth. It takes 4 seconds to reach the ground (assuming no air resistance). How far did the tennis ball fall? Initial velocity is zero!

Assume g = 9.8 m/s²

Answer rating: 100% (QA)

1 The property of the puck that keeps it moving is its inertia Once the puck reaches a constant spee... View the full answer