# motion and pressure

definition for the word speed
how far something travels in a particular time
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state the unit of speed used in science
metres per seconds (m/s)
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what is the equation for speed
distanced traveled over time taken
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state what is meant by relative motion
how fast one thing is moving compared to another
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state what a distance/time graph shows
how something moves
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state what a slope in a distance time graph shows
a constant speed
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state what an arch in a distance/time graph means
acceleration
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state what happens to the speed of gas molecules when the temperature goes down
move more slowly
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state what happens to atmospheric pressure as you go up a mountain
there is less atmospheric pressure making it harder to breath
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what does incompressible mean
can not be compressed
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state what happens to liquid pressure as you go deeper into a lake
there will be more pressure
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state what direction pressure acts
90 degrees
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state the equation for pressure
force over area
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state the units of pressure
N/cm2
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state the unit of a moment
newton metres (nm)
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state the law of moments
when an object is in equilibrium, the sum of the clockwise moments is equal to the sum of the anticlockwise moments
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describe what is meant by centre of gravity
when it is above the pivot, there is no turning force; all the weight of an object acts through this point
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## Other cards in this set

### Card 2

#### Front

state the unit of speed used in science

#### Back

metres per seconds (m/s)

### Card 3

#### Front

what is the equation for speed

### Card 4

#### Front

state what is meant by relative motion

### Card 5

#### Front

state what a distance/time graph shows