# motion

Acceleration
The amount of 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 time taken for a complete jouney
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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 seens to act
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compressed
squashed into smaller space.
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density
the mass of 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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gas pressure
the force exerted by air particles when they collide with a surface
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incompresible
cannot be compressed/ squashed
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instantaneuos speed
the speed at a particular moment
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law of moments
an object is an equilibrium 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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metres per second
a unit of speed
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moment
a measure of the ability of a force to rotate an object about a pivot
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newton metres
the unit of moment
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newtons per metre squared
a unit of pessure
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pivot
the point about which a lever or see-saw balances
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pressure
a force exerted on a certain area
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realtive motion
the difference between the speeds of two moving objects, or of a moving and a stationary object
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speed
a measure of how far something travels ina given time
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## Other cards in this set

### Card 2

#### Front

Atmospheric Pressure

#### Back

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

Average speed

### Card 4

#### Front

Centre of gravity

centre of mass