Essay Quiz


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



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



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



4		Compare the force of gravity on an object at rest, the same object in free fall, and the same object moving horizontally to the surface of the earth.



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



6		What maintains the speed of Earth as it moves in its orbit around the Sun?



7		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.)



8		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, and the space station to have negligible mass, will the two rockets have the same acceleration? Explain.



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



10		Is a constant force necessary for a constant acceleration? Explain.



11		Is an unbalanced force necessary to maintain a constant speed? Explain.



12		Use Newton's laws of motion to explain why water leaves the wet clothes when a washer is in the spin cycle.

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