Question 1

The Earth and the Moon gravitationally attract each other.Does the more massive Earth attract the Moon with a greater force,the same force,or less force than the Moon attracts the Earth? What reasoning guides your answer?

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Question 2

If the Earth had twice its present radius and twice its present mass,what change in weight would you experience? Explain.

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Question 3

Shoot a cannonball horizontally from a cannon at a mountain top and it gains speed as it falls and hits the ground below.But fire the cannonball fast enough for circular orbit and no change in speed occurs.Why?

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Question 4

How is stepping off a curb similar to taking a ride aboard an orbiting space vehicle?

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Question 5

What holds a circularly-moving satellite in orbit while the force of gravity pulls downward on it?

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Question 6

Why does a satellite in elliptical orbit gain speed as it moves closer to the planet? When is its kinetic energy greatest? Least? Where is its potential energy greatest? The least?

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Question 7

Toss a rock at an angle into the air and it follows a curved path.Its velocity at any instant can be resolved into horizontal and vertical components.Which of these components changes with time,and why?

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Quiz 4: Gravity, Projectiles, and Satellites