What two conditions must be met before you can use the three equations we derived in this module?

What is air resistance?

How does air resistance affect the acceleration of a falling object?

What is the definition of free fall?

A very picky physicist says that no object can really experience free fall when falling near the surface of the earth. Explain why the physicist is technically correct.

If an object is thrown up in the air, where is its velocity zero?

When its velocity is zero, what is its acceleration?

A ball is thrown up in the air with an initial velocity of 1.2 m/sec. If the ball is caught at exactly the same height from which it was thrown, what will its velocity be?

An athlete runs at a constant velocity of 3.0 m/sec. How far will the athlete travel in 25 minutes?

A BMW 535I can accelerate from 0.0 to 60.0 mph in 7.9 seconds. What is its acceleration?

6. A boat travels for 2.0 hours at a constant velocity of 5.0 m/sec. How far does the boat travel? (1 hr = 3,600 sec)

7. To measure the height of a building without a ruler or tape measure, an engineer drops a rock off the top of the building and finds out that it takes 7.9 seconds for the rock to reach the ground. How high is the building?

A driver is driving down the road and sees a deer in his headlights. The driver hits the brakes, which provide a acceleration of -4.0 m/sec2. If the car’s initial velocity was 9 m/sec, how far will the car travel before coming to a stop?

9. If a runner starts from rest and accelerates at .7 ft/sec2 for 2.0 minute, how far will the runner travel?

1. What if the air were “THICKER” and the molecules and atoms in the air more difficult to move. Would you expect the air resistance in your experiments to be more, less, or the same as it would be if it were thinner?

2. If the air were to be “thicker” would you expect the terminal velocity of the objects you are studying to be lower, higher, or the same as without fog?

A cannon shoots its cannonball straight up in the air with an initial velocity of 500 m/sec. What is the maximum height that the cannonball can reach?

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