Answers2001310 Earth Science Sem 1 - ReevesTypes of Radioactive Decay

Gravity Answers

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1
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What is the only force that can act on an object in free fall?

A
gravity
B
friction
C
air resistance
D
speed
2
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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
3

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.
4

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
5

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
6

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.
7

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
8

The table shows the masses of four objects.

Question illustration
A
the book
B
the rock
C
the box
D
the fish
9

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.
10

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.
11

A spacecraft is launched from Earth toward the moon.

c
closer to Earth than to the moon because the moon has greater mass than Earth
c
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
c
closer to the moon than to Earth because Earth has greater mass than the moon
12

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
13

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.
14

The gravitational force between two objects is 100 N.

2
25 N
5
50 N
2
200 N
4
400 N

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