AnswersMad 2017 Phy Sci B -33 SSGravity

Gravity Answers

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1
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Hector drew the diagram below to illustrate projectile motion.

Question illustration
H
He should switch the labels “Gravity” and “Inertia.”
H
He should make the arrow for “Path” curve downward.
H
He should switch the labels “Inertia” and “Path.”
H
He should make the arrow for “Inertia” curve downward.
2
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Why are objects that fall near Earth’s surface rarely in free fall?

G
Gravity does not act on objects near Earth’s surface.
A
Air exerts forces on falling objects near Earth’s surface.
T
The objects do not reach terminal velocity.
T
The objects can be pushed upward by gravity.
3

Increasing which factor will cause the gravitational force between two objects to decrease?

A
weights of the objects
B
distance between the objects
C
acceleration of the objects
D
masses of the objects
4

A ball is thrown forward at 5 m/s.

A
The ball would follow a curved path on Earth but a straight path on the moon.
B
The ball would follow the same curved path on Earth as on the moon.
C
The ball would curve down more sharply on Earth than on the moon.
D
The ball would curve down on Earth but curve up on the moon.
5

What determines the path that an object in projectile motion follows? (Ignore air resistance)

A
gravity only
B
inertia only
C
gravity and inertia
D
neither gravity or inertia
6

Which factors affect the gravitational force between two objects?

A
distance and velocity
B
mass and distance
C
mass and weight
D
acceleration and weight
7

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.
8

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.
9

What is the weight, on Earth, of a book with a mass of 1.5 kg?

A
1.5 N
B
6.5 N
C
11.3 N
D
14.7 N
10

What is the only force that can act on an object in free fall?

A
gravity
B
friction
C
air resistance
D
speed
11

A spacecraft is launched from Earth toward the moon.

A
closer to Earth than to the moon because the moon has greater mass than Earth
B
closer to the moon than to Earth because the moon has greater mass than Earth
C
closer to Earth than to the moon because Earth has greater mass than the moon
D
closer to the moon than to Earth because Earth has greater mass than the moon
12

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.
13

What units are used to measure mass and weight?

A
Mass and weight are measured in kilograms.
B
Mass and weight are measured in newtons.
C
Mass is measured in kilograms, and weight is measured in newtons.
D
Mass is measured in newtons, and weight is measured in kilograms.
14

Hector drew the diagram below to illustrate projectile motion.

Question illustration
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.
15

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.
16

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 objects
B
decreasing the masses of the objects and decreasing the distance between the objects
C
increasing the masses of the objects and decreasing the distance between the objects
D
decreasing the masses of the objects and increasing the distance between the objects
17

What units are used to measure mass and weight?

M
Mass and weight are measured in kilograms.
M
Mass and weight are measured in newtons.
M
Mass is measured in kilograms, and weight is measured in newtons.
M
Mass is measured in newtons, and weight is measured in kilograms.
18

When does a skydiver achieve terminal velocity?

A
when gravity equals air resistance
B
when gravity is greater than air resistance
C
when air resistance acts on the diver and gravity does not
D
when gravity acts on the diver and air resistance does not
19

A ball is thrown forward at 5 m/s.

A
The ball would follow a curved path on Earth but a straight path on the moon.
B
The ball would follow the same curved path on Earth as on the moon.
C
The ball would curve down more sharply on Earth than on the moon.
D
The ball would curve down on Earth but curve up on the moon.

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