5. While it is in flight, how many forces are acting on Stone 1? a. Zero b. One:

Question

5. While it is in flight, how many forces are acting on Stone 1? a. Zero b. One: c. Two. 6. How high is the cliff? a. Less than 30 m; b. Between 30 and 50 m; c. Between 50 and 75 m d. More than 75 m. A5 kg rock is dropped from the top of a tall building. Air resistance is present. Questions 7-12 refer to this situation after the rock has been released. 7 While it is moving down, how many forces are acting on the rock? a. Zero b. One: c. Two d. More than two. s. Before it reaches terminal velocity, the rock's motion is described by: a. Newton's first law; b. Newton's second law. 9. When it reaches terminal velocity, how many are acting on the rock? a. Zero b. One c. Two d. More than two. lo. When it reaches terminal velocity, the force of air resistance on the rock equals: a. ON; b. 5 N; c, 49 N; d. None of the above. Once it has reached terminal velocity, the rock's motion is described by: a. Newton's first law; b. Newton's second law,

Explanation / Answer

7.

two

force of gravity in down direction and air resistance in up direction

8.

newton's second law.

since the stone is accelerated in down direction

9.

two

air resistance and gravity force

10.

air resistance = 5 x 9.8 = 49 N

11

newtons first law

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