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Year 7 Science > Forces and Speed > Flashcards

Forces and Speed Flashcards

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1
Q

What is a force?

A

A push or a pull.

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2
Q

Friction

A

The force between two surfaces sliding over one another, that causes them to heat up and wear.

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3
Q

Weight

A

The force that pulls objects towards the centre of the Earth.

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4
Q

Air resistance/drag

A

A force acting against any object that is moving through the Earth’s atmosphere.

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5
Q

Lift

A

A force pushing upwards on an object flying through the air.

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6
Q

Upthrust

A

A force pushing upwards on an object moving through a liquid

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7
Q

Thrust

A

A push caused by an engine

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8
Q

What is one Newton roughly equal to in grams?

A

100g

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9
Q

When will an object float?

A

When it is less dense than the liquid it is placed in.

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10
Q

What is the unit for density?

A

g/cm^3

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11
Q

Upthrust =

A

weight in air minus weight in water

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12
Q

Density=

A

mass /volume

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13
Q

What does weight measure?

A

The effect gravity is having on an object

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14
Q

What is weight measured in and what do you measure it with?

A

Newtons, a newton meter.

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15
Q

What does mass measure?

A

How much of something there is

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16
Q

What is mass measured in and how is it measured?

A

Kilograms, a mass pan balance

17
Q

Weight=

A

mass*10= the attraction of earth= 10N/Kg

18
Q

What is the Archimedes Principle?

A

The volume of water displaced is equal to the volume of the object.

19
Q

What is the Plimsoll Line?

A

A mark on a ship’s hull which indicates the maximum depth to which the vessel may be safely loaded.

20
Q

What reduces friction?

A

Lubrication or streamlining

21
Q

What are the characteristics of a streamlined shape?

A

A rounded front; a slowly tapering tail; and a smooth shape with no projections

22
Q

Volume=

A

mass/density

23
Q

Mass=

A

Density*volume

24
Q

Distance=

A

Speed*time

25
Q

Time=

A

Distance/speed

26
Q

Speed=

A

Distance/time

27
Q

Independent variable/Input variable

A

what changes

28
Q

Dependent Variable/Outcome variable

A

what we measure

29
Q

Control variable

A

what we keep constant

Year 7 Science (1 decks)

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