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Science Traffic Test > Forces > Flashcards

Forces Flashcards

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1
Q

A moon buggy has a weight of 800KG. What will its weight in deep space be?

A

0 N

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2
Q

In which direction is the net force of a braking car heading west?

A

East

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3
Q

If a stationary astronaut in space is pushed for a short instant by a small force what will happen?

A

She will continue to move in a straight line unless acted upon by another force

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4
Q

What is an example of a force that changes the direction but not the speed of an object?

A

A planet in orbit around the sun attracted by the force of gravity

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5
Q

What can a force be described as?

A

A push or pull

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6
Q

What is a situation which only involves pull forces?

A

A rock falling to the moon

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7
Q

What is the difference between an attractive and repulsive force?

A

An attractive force is a push, whereas a repulsive force is a pull

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8
Q

What can a force do?

A

Change the speed of an object, get an object to move, stop a moving object and change the direction of a moving object

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9
Q

What are the three types of forces?

A

Gravitational, electric and magnetic

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10
Q

What is an example of a gravitational force?

A

The moon attracted to the Earth

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11
Q

What is an example of an electric force?

A

A charged comb lifting a person’s hair

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12
Q

What is an example of a magnetic force?

A

A magnet pulling a ball-bearing along a table

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13
Q

What is the unit of force?

A

The Newton (N), named after Isaac Newton

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14
Q

What is one newton the force of?

A

100 grams

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15
Q

To convert mass to force, what must you do?

A

Multiply the mass by 10

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16
Q

What is weight?

A

The force of gravity acting on an object

17
Q

What is mass?

A

The amount of matter in an object

18
Q

How do you calculate the weight of someone on the moon?

A

Divide their weight by 6, then multiply by 10

19
Q

What does a spring balance measure?

A

Weight

20
Q

What does a triple arm balance measure?

A

Mass

21
Q

What happens to an object with a net force acting on it?

A

It will experience a change in motion

22
Q

What are the two most important aspects of forces?

A

Size and direction of force

23
Q

What is Newton’s third law of motion?

A

If Object A exerts a force on Object B, then Object B exerts an equal-sized force on Object A in the opposite direction

24
Q

During Newton’s third law of motion, describe the pairs of forces?

A

These pairs of forces are equal in size, opposite in direction and act on different objects

25
Q

When an object is moving at constant speed, what is the size of the net force?

A

0 Newtons

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