Gravity Answers
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What is the only force that can act on an object in free fall?
A
gravityB
frictionC
air resistanceD
speed2
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What is the weight, on Earth, of a book with a mass of 1.5 kg?
A
1.5 NB
6.5 NC
11.3 ND
14.7 N3
Which change will always result in an increase in the gravitational force between two objects?
A
increasing the masses of the objects and increasing the distance between the objectsB
decreasing the masses of the objects and decreasing the distance between the objectsC
increasing the masses of the objects and decreasing the distance between the objectsD
decreasing the masses of the objects and increasing the distance between the objects4
Increasing which factor will cause the gravitational force between two objects to decrease?
A
weights of the objectsB
distance between the objectsC
acceleration of the objectsD
masses of the objects5
When does a skydiver achieve terminal velocity?
A
when gravity equals air resistanceB
when gravity is greater than air resistanceC
when air resistance acts on the diver and gravity does notD
when gravity acts on the diver and air resistance does not6
Which describes an object in projectile motion?
A
Gravity acts to push the object sideways.B
The object moves in a straight path.C
The forward velocity of the object is 0 m/s.D
The object’s inertia carries it forward.7
Why are objects that fall near Earth’s surface rarely in free fall?
A
Gravity does not act on objects near Earth’s surface.B
Air exerts forces on falling objects near Earth’s surface.C
The objects do not reach terminal velocity.D
The objects can be pushed upward by gravity.8
Hector drew the diagram below to illustrate projectile motion.
A
He should switch the labels “Gravity” and “Inertia.”B
He should make the arrow for “Path” curve downward.C
He should switch the labels “Inertia” and “Path.”D
He should make the arrow for “Inertia” curve downward.9
Which statement best compares the accelerations of two objects in free fall?
A
The heavier object has a greater acceleration.B
The object that has the greater surface area has the lower acceleration.C
The object that has the smaller mass has the greater acceleration.D
The objects have the same acceleration.10
The table shows the masses of four objects.
A
the bookB
the rockC
the boxD
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