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Questions for Thought
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1

An insect inside a bus flies from the back toward the front at 5.0 mi/h. The bus is moving in a straight line at 50.0 mi/h. What is the speed of the insect?
2

Disregarding air friction, describe all the forces acting on a bullet shot from a rifle into the air.
3

Can gravity act in a vacuum? Explain.
4

Is it possible for a small car to have the same momentum as a large truck? Explain.
5

What net force is needed to maintain the constant velocity of a car moving in a straight line? Explain.
6

How can there ever be an unbalanced force on an object if every action has an equal and opposite reaction?
7

Why should you bend your knees as you hit the ground after jumping from a roof?
8

Is it possible for your weight to change as your mass remains constant? Explain.
9

What maintains the speed of the earth as it moves in its orbit around the sun?
10

Suppose you are standing on the ice of a frozen lake and there is no friction whatsoever.How can you get off the ice? (Hint: Friction is necessary to crawl or walk, so that will not get you off the ice.)
11

A rocket blasts off from a platform on a space station. An identical rocket blasts off from free space. Considering everything else to be equal, will the two rockets have the same acceleration? Explain.
12

An astronaut leaves a spaceship that is moving through free space to adjust an antenna. Will the spaceship move off and leave the astronaut behind? Explain.





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