# Gravity: Question Preview (ID: 12559)

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Why does the Moon orbit the Earth?
a) The Moon is less dense than Earth.
b) The mass of Earth is much greater than the Moon.
c) The Moon came into orbit around Earth after Earth was established.
d) The velocity of the Moon in orbit is faster than the velocity of Earth in orbit around the Sun.

If the Moon moved farther away from Earth, what would happen to the gravitational force between Earth and the Moon?
a) The force would increase proportional to the distance.
b) The force would decrease proportional to the distance.
c) The force would increase by the inverse square of the distance.
d) The force would decrease by the inverse square of the distance.

What is the formula for the law of universal gravitation?
a) Force = G * mass1 * mass2 / distance
b) Force = G * mass1 * mass2 * distance
c) Force = G * mass1 * mass2 / distance2
d) Force = G * mass1 * mass2 * distance2

If two asteroids moved closer together, what would be the result on the gravitational force each asteroid exerts on the other?
a) The gravitational force would increase.
b) The gravitational force would decrease.
c) The gravitational force would remain the same.
d) None of these

Which of Kepler's laws gave Newton the idea about gravitational force and how it is related to distance?
a) law of ellipses
b) law of relativity
c) law of equal areas
d) law of universal gravitation

Which of the following BEST describes the term terminal velocity
a) the density of the air around an object
b) the force of the air pushing on a moving object
c) the weight of the air pushing down on an object
d) the temperature of the air around a moving object

Terminal velocity is the velocity of _______
a) a falling object when it starts to break apart
b) an accelerating object when it hits the ground
c) an object falling in a vacuum (an environment without air)
d) a falling object if the force of air resistance equals the force of gravity

In a vacuum (an environment without air), what will happen when two objects with different mass are dropped at the same time from the same height?
a) They both land at the same time.
b) The less massive object lands first.
c) The more massive object lands first.
d) There is no way to test this condition.

Which factor increases the air resistance on an object?
a) decreasing air pressure
b) decreasing the density of the object
c) less surface area facing the force of air
d) more surface area facing the force of air

Which of the following is a true statement about objects in a vacuum?
a) A feather will fall faster than a bowling ball.
b) A feather will fall slower than a bowling ball.
c) A feather and a bowling ball will fall at the same rate.
d) Both a feather and a bowling ball canâ€™t fall, but will always remain motionless.

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