# Gravity: Question Preview (ID: 12558)

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The force of gravity between two objects is directly proportional to which of the following?
a) The masses of each object.
b) The velocity of each object.
c) The distance between the objects squared.
d) The mass of one object and the distance between objects.

The sun has more mass than Earth, which has more mass than the moon. If the distance between each object was the same, which gravitational force would be the largest?
a) The gravitational force between the sun and Earth.
b) The gravitational force between Earth and the moon.
c) The gravitational force between the moon and the sun.
d) The gravitational force between each pair of object would be the same.

Which of the following ideas did Johannes Kepler propose?
a) Newton's first law.
b) Law of Equal Areas
c) Law of Universal Gravitation
d) Law of Equal and Opposite Forces

Suppose the sun was replaced by a star that had twice as much mass. How would the gravitational force between the sun and its planets change?
a) The gravitational force would stay the same.
b) The gravitational force would be half as large.
c) The gravitational force would be twice as big
d) The gravitational force would now depend on the square of the distance to each planet.

Which of the following would increase the gravitational force between two objects, X and Y?
a) Decreasing the mass of object X.
b) Decreasing the mass of object Y.
c) Decreasing the velocity of each object.
d) Decreasing the distance between them.

How does a parachute change the terminal velocity of a skydiver?
a) It will increase her terminal velocity.
b) It will decrease her terminal velocity.
c) It will reduce her terminal velocity to zero.
d) It will change the direction of her terminal velocity.

The phrase terminal velocity can best be defined as
a) the velocity of any falling object
b) the velocity of objects with little mass
c) the constant velocity of some falling objects
d) the velocity of something falling from a train terminal

Which of the following statements about an object traveling at terminal velocity is true?
a) The object is accelerating.
b) The object is not accelerating.
c) The object's velocity is zero.
d) Unbalanced forces are acting on the object.

A leaf falls from a tree. As you are watching the leaf fall, how can you tell that is has reached its terminal velocity?
a) The leaf is accelerating.
b) The leaf hits the ground.
c) The leaf is experiencing a force.
d) The leaf is falling with a constant velocity.

A tree branch falls from a tree, accelerating at a constant rate until it hits the ground. Did the tree branch reach terminal velocity?
a) No, because if it had it would not have hit the ground.
b) Yes, because the tree branch fell at a constant velocity.
c) Yes, because the forces on the tree branch were balanced.
d) No, because it continued to accelerate until it hit the ground.

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