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Forces test revision > Test > Flashcards

Test Flashcards

1
Q

What is a force?

A

A push, pull, twist or turn (or a mix of several) that causes a change in speed, shape and (or) direction.

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2
Q

What is friction?

A

Friction is a force between two surfaces, causing them to heat up and wear.

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3
Q

What is weight measured in?

A

NEWTONS!! (not grams)

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4
Q

What is gravity?

A

The force that holds you down to Earth.

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5
Q

What is drag?

A

The force acting against anything moving in the Earth’s atmosphere.

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6
Q

What is lift ?

A

The force pushing upwards on an object flying in the air.

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7
Q

What is upthrust?

A

The force pushing upwards on an object in liquid.

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8
Q

What is thrust?

A

A push caused by an engine.

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9
Q

What is mass measured in?

A

Grams (kilo)

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10
Q

What is the formula to work out speed?

A

s=d/t

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11
Q

What is the formula to work out distance?

A

d=ts

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12
Q

What is the formula to work out time?

A

t=d/s

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13
Q

Who discovered the law of elascticity

A

Robert Hooke

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14
Q

When forces are balanced the force arrows are…

A

Equal

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15
Q

Weight is…

A

mass multiplied by the gravitational field strength.

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16
Q

Hooke’s law show’s that …

A

The greater the force on an elastic object, the greater the extension.

17
Q

Why is friction useful?

A

It can help us too decelerate.

18
Q

Why is friction a menace?

A

It lowers our rate of acceleration.

19
Q

When is friction used?

A

Car breaks.

20
Q

When is drag used?

A

Parachuting.

21
Q

The gravitational force can affect your…

A

Weight.

22
Q

But not change your…

A

Mass

23
Q

When you are moving at a constant speed the…

A

Force arrows will all be equal

24
Q

When accelerating the…

A

Force arrow pointing the way you are going will be longer than the rest.

25
Q

When decelerating the…

A

Force arrow pointing opposite the way you wish to go will be larger than the rest.

26
Q

Why is gravity important?

A

Without it we would be flying.

27
Q

An engine makes which force occur?

A

Thrust

28
Q

A parachuter uses which force

A

Air resistance.

29
Q

Two surfaces rubbing against each other makes…

A

Friction

30
Q

Forces are

A

Nescesary

Forces test revision (1 decks)

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