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Lesson 7.1 Fundamental Forces in Space Answers

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1
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Which is an example of the electromagnetic force?

A
A compass needle points north toward Earth’s magnetic pole.
B
An iron nail rolls off a table and falls to the ground.
C
The moon pulls on the water in Earth’s oceans, causing tides.
D
Protons that make up a nitrogen atom stay together in the nucleus.
2
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Which best contrasts the weak force and the electromagnetic force?

A
The weak force acts within protons and neutrons, and the electromagnetic force has an infinite range.
B
The weak force is attractive and repulsive, and the electromagnetic force is attractive only.
C
The weak force is attractive only, and the electromagnetic force is attractive and repulsive.
D
The weak force has an infinite range, and the electromagnetic force acts within protons and neutrons.
3

Lynn rubs a balloon with a piece of wool, which causes the balloon to pick up some of the electric charges from the wool. Lynn then observes that the balloon temporarily sticks to a wall. After several seconds, the balloon falls to the ground.

A
The strong force causes the balloon to stick to the wall, and the weak force causes the balloon to fall to the ground.
B
The weak force causes the balloon to stick to the wall, and the strong force causes the balloon to fall to the ground.
C
The electromagnetic force causes the balloon to stick to the wall, and gravitational force causes the balloon to fall to the ground.
D
Gravitational force causes the balloon to stick to the wall, and electromagnetic force causes the balloon to fall to the ground.
4

Ellen does an experiment by releasing a ball from a height of 1 m above each floor in a tall building. She records the time it takes the ball to reach the floor.

A
How does distance affect the gravitational force on objects?
B
How does distance affect the electromagnetic force on objects?
C
Does height affect the strong force acting on a moving ball?
D
Does height affect the weak force acting on a moving ball?
5

How many fundamental forces exist in nature?

A
two
B
three
C
four
D
five
6

Which is a force that attracts any two pieces of matter in the universe?

A
weak
B
static
C
electromagnetic
D
gravitational
7

Which best completes the statement?The electromagnetic force ________ than the gravitational force.

A
is stronger
B
is weaker
C
has greater range
D
has shorter range
8

Sayyid drew a diagram to compare the gravitational and electromagnetic forces.

Question illustration
A
is attractive only
B
acts within nucleus
C
attracts and repels
D
has an infinite range
9

Which fundamental force has a small range and is always an attractive force?

A
strong
B
gravitational
C
weak
D
electromagnetic
10

The diagram shows the protons and neutrons in an atom.

Question illustration
A
static
B
electromagnetic
C
strong
D
light
11

Yanni made a chart to compare the strong and weak forces. Which best describes Yanni’s error?

Question illustration
A
Only the weak force is active in the nuclei of atoms.
B
The weak force keeps particles that make up neutrons together.
C
The strong force overcomes repulsion and keeps protons together.
D
The strong force is responsible for radioactive decay.
12

Which is an example of the gravitational force?

A
A basketball that was thrown in the air falls to the ground.
B
The particles that make up the neutrons in an oxygen atom are held together.
C
A radioactive element, uranium, decays and becomes stable.
D
The molecules that make up olive oil stick together.
13

How are the weak and the strong forces alike?

A
They have infinite ranges.
B
They are attractive only.
C
They are attractive and repulsive.
D
They have very small ranges.
14

The diagram shows an investigation that Antwoine is conducting.

Question illustration
A
gravitational
B
strong
C
weak
D
electromagnetic
15

Which shows the correct order of forces, from weakest to strongest?

A
weak, strong, gravitational, electromagnetic
B
electromagnetic, weak, strong, gravitational
C
gravitational, weak, electromagnetic, strong
D
weak, electromagnetic, gravitational, strong
16

Which best describes the electromagnetic force?

A
weak, but stronger than the strong force
B
strong, but weaker than the weak force
C
weak, but stronger than the gravitational force
D
strong, but weaker than the gravitational force

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