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Science > Forces and Speed > Flashcards

Forces and Speed Flashcards

1
Q

What is a force?

A

A push or a pull

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2
Q

What force pulls me down to earth?

A

Weight

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3
Q

What force keeps boats and other objects afloat?

A

Upthrust

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4
Q

What is the formula for calculating weight?

A

Weight=mass x gravitational field strength

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5
Q

Is weight a force?

A

Yes

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6
Q

What is weight measured in?

A

Newtons (N)

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7
Q

What is mass measured in?

A

Kilograms (kg)

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8
Q

What are 3 characteristics of a streamlined shape?

A

1) rounded front
2) slowly tapering tail
3) smooth shape with no projections

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9
Q

What are two ways to reduce friction?

A

1) Lubrication

2) Streamlining

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10
Q

What is the formula for calculating density?

A

Density=mass/volume

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11
Q

What is the formula for calculating speed?

A

Speed=distance/time

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12
Q

What is mass?

A

The amount of matter a thing is made up of

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13
Q

What is friction?

A

The force that resists movement because of contact between two surfaces

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14
Q

What does it mean if something is streamlined?

A

If something is streamlined it is shaped to reduce resistance to motion from air or water

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15
Q

What is weight?

A

The force of the Earth on an object due to its mass

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16
Q

What is a newton meter?

A

A piece of equipment used to measure weight in newtons

17
Q

Can you give 3 examples when friction is useful?

A

There are many e.g. brakes, matches and even walking

18
Q

What is the formula for time?

A

Time=distance/speed

19
Q

What does compress mean?

A

To squash into a smaller space

20
Q

What is lubrication?

A

A substance that reduces friction between surfaces when they rub together

21
Q

What is the definition of a driving force?

A

The force that is pushing or pulling something

22
Q

What happens if something deforms?

A

It changes shape

Science (1 decks)

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