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Lesson 7.2 Gravity and Motion Answers

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Which action results from the combination of gravity and inertia working on the moon?

A
the moon’s orbit around Earth
B
Earth’s downward pull on the moon
C
the moon’s push against other planets
D
Earth’s gravitational pull toward the moon
2
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Which statement best explains why objects are pulled toward Earth’s center?

A
Earth has a magnetic force that is strongest at its core.
B
Earth has a much greater mass than objects on its surface.
C
The weight of the atmosphere pushes objects toward Earth's surface.
D
The strength of the Sun’s gravity pushes down on objects at Earth's surface.
3

Which of the moon’s properties prevents it from being pulled inward by Earth?

A
gravity
B
inertia
C
shape
D
structure
4

In addition to how much force Earth exerts on the object, which features of an object affect its weight?

A
mass and location of the object
B
shape and location of the object
C
location of the object and how much energy the object has
D
mass of the object and how much energy the object has
5

Which statement describes how Earth compares to the moon?

A
Earth has more inertia than the moon.
B
The moon has more gravitational pull than Earth.
C
The moon rotates at a constant speed while Earth’s speed varies.
D
Earth and the moon will not change their motion when acted on by a force.
6

Which pair of factors affects the force of gravity between objects?

A
direction and distance
B
mass and distance
C
mass and shape
D
shape and time
7

Which statement describes gravity?

A
There is no defined unit of measurement for gravity.
B
Gravity is the force that pulls objects toward Earth’s center.
C
Objects that have a small mass will have no gravitational pull.
D
Gravitational pull between two objects decreases as the mass of one increases.
8

The diagram shows the moon and Earth in space.

Question illustration
A
force of Earth’s gravity
B
moon’s attraction to the Sun
C
moon’s motion without gravity
D
orbit of the moon around Earth
9

According to Newton’s first law, which characteristic of a moving object would remain constant if there were no other forces acting on it?

A
size
B
mass
C
shape
D
speed
10

The diagrams show objects’ gravitational pull toward each other.

Question illustration
A
Gravity attracts only larger objects toward one another.
B
Gravity attracts larger objects only if they are close to one another.
C
If the masses of the objects increase, then the force between them also increases.
D
If distance between the objects increases, then the amount of force also increases.
11

Which statement explains how weight is different from mass?

A
Mass is a varying property.
B
Mass is measured in newtons.
C
Weight is always greater than mass.
D
Weight is a measure of gravitational pull.
12

Which statement describes Newton’s law of universal gravitation?

A
Mass has little effect on gravity between objects.
B
Gravity pushes objects away from Earth’s center.
C
Gravity does not act between Earth and the moon.
D
Every object in the universe attracts every other object.
13

A student is asked to describe the path of a paper airplane that is thrown in the classroom.Which statement best describes the path of the paper airplane?

A
The paper airplane will move in a straight line, according to Newton’s first law of motion.
B
The paper airplane will drop straight to the ground once its inertia gives in to the force of gravity.
C
The paper airplane will create a curved path toward the floor as it is pulled toward Earth’s center.
D
The paper airplane will orbit around the desk because it is the object with the largest mass in the room.
14

Which description explains how inertia changes the effects of gravity on objects in the solar system?

A
keeps the Sun stationary
B
pulls asteroids toward Earth
C
causes shooting stars to stop moving
D
prevents planets from pulling into one another
15

Which statement explains how gravity and inertia work together?

A
They change the motion of objects.
B
They take turns working on objects.
C
They keep all objects moving at the same speed.
D
They prevent objects from moving in a circular motion.

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