AP Physics Gravity pratice quiz

A spaceship is travelling to the moon. At what point is it beyond the pull of the Earth's Gravity

• when it gets above the atmosphere

• when it is half-way there

• when it is closer to the moon than it is to earth

• It is never beyond the pull of earth's gravity

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If you stood on a planet having a mass of four that of the earth's mass, and a radius two times that of Earth's radius, you would weigh,

• two times more than you do on earth

• the same as you do on earth

• two times less than you do on earth

• four times more than you do on earth

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A piece of space debris is released from rest at an altitude that is two earth radii from the center of the earth. Compared to its weight on earth, the weight of this debris is

• The same as on the surface of the earth

• one-half of its weight on the surface of the earth

• one-third of its weight on the surface of the earth

• one-quarter of its weight on the surface of the earth

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A satellite encircles mars at a distance above its surface equal to 3 times the radius of mars. if g_m is the acceleration due to gravity at the surface of mars, what is the acceleration due to gravity at the location of the satellite

• gm/2

• 0

• gm/3

• gm/4

• gm/16

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A hypothetical planet has a mass of one-half that of the earth and a radius of twice that of the earth. What is the acceleration due to gravity on the planet in terms of g, the acceleration due to gravity at the surface of the earth?

• g

• g/2

• g/4

• g/8

• g/16

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The acceleration due to gravity on Planet A is one-sixth what it is on Planet B, and the radius of Planet A is one-fourth that of Planet B. The mass of planet A is what fraction of the mass of Planet B

• 1/6

• 1/16

• 1/24

• 1/96

• 1/12

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Two planets have the same surface gravity, but planet B has twice the radius of planet A. If planet A has mass m, what is the mass of planet B

• m/(sqrt2)

• m

• m(sqrt2)

• 4m

• m/4

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Two planets have the same surface gravity, but planet B has twice the mass of planet A. If planet A has radius r, what is the radius of planet B

• r/(sqrt2)

• r

• r(sqrt2)

• 4r

• 2r

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Planet A has twice the mass of planet B. From this information, what could we conclude about the acceleration due to gravity at the surface of planet A compared to that at the surface of Planet B?

• The acceleration due to gravity on planet A must be twice as great as the acceleration due to gravity on planet B

• The acceleration due to gravity on planet A must be four times as great as the acceleration due to gravity on planet B

• The acceleration due to gravity on planet A is the same as the acceleration due to gravity on planet B

• The acceleration due to gravity on planet A is greater than the acceleration due to gravity on planet B, but we cannot say how much greater

• We cannot conclude anything about the acceleration due to gravity on planet A without knowing the radii of the two planets

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The reason an astronaut in an earth satellite feels weightless is that

• the astronaut is beyond the range of the earth's gravity

• the astronaut is falling

• the astronaut is at a point in space where the effects of the moon's gravity and the earth's gravity cancel

• this is a psychological effect associated with rapid motion

• the astronaut's acceleration is zero

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