# Motion And Pressure

Acceleration
The amount by which speed increases in one second.
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Atmospheric pressure
Pressure caused by the collisions of air molecules that produce a force on an area
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Average Speed
The total distance travelled in the total time taken for a complete journey
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Centre of gravity
The point in an object where the force of gravity seems to act
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Centre of mass
The point in an object where the mass of an object seems to act
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Compressed
Squashed into a smaller space.
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Density
The mass of a material in a certain volume
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Distance-time graph
A graph that shows how far an object moves each second
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Incompressible
Cannot be compressed(squashed)
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Instaneous speed
The speed at a particular moment
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Law of moments
An object is in equlibrium if the clockwise moments equal the anticlockwise moments
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Liquid Pressure
The pressure produced by collisions of particles in a liquid
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Relative Motion
The difference between the speeds of 2 moving or of a moving and a stationary object
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Moment
A measure of the ability of a force to rotate an object about a pivot
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Pivot
The point about which a lever or sea-saw balances
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Pressure
A force exerted on a certain area
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Speed
A measure of how far something travels in a given time
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## Other cards in this set

### Card 2

#### Front

Pressure caused by the collisions of air molecules that produce a force on an area

#### Back

Atmospheric pressure

### Card 3

#### Front

The total distance travelled in the total time taken for a complete journey

### Card 4

#### Front

The point in an object where the force of gravity seems to act

### Card 5

#### Front

The point in an object where the mass of an object seems to act