# motion

instantaneous speed
the speed a runner is travelling at any time during a race
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how do you make the average speed?
you make it by dividing the total distance by time that it took to run the race
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what do you need to calculate speed?
you need to know the time and distance.
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how do you calculate the average speed?
you divide the total distance by the total time.
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what does a distance time graph show us?
it shows us the distance that an object travels in a certain time
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what does the steepness of the line on the graph show?
shows you the speed i.e very steep very fast
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what does it mean if the line is horizontal
it means the object is stationary.
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ow is a graph not realistic
normally you world measure it miless per hour not for example meteras per second.
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gas pressure
if there are more oliisions on the inside than the outside the balloon gets bigger
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the changes in atmospheric pressure at altitude increases
the pressure decreases
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why would a climber have a tank of oxygen with him while climbing a mountain?
there is smaller atmospheric pressure which makes it hard to breathe oxygen.
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why does oxygen have to be compressed in tank?
it has to be compressed because when it is there is a smaller volume so it takes up less space
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why would a hot can collapse when put into cold water?
it collapses as water lets the boiling steam out causing the outside air pressure to cause a large force to make the can collapse.
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pressure in liquids
the pressure in liquid acts in all directions
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what is pressure
pressure is a measure of how much force is applied over a certain area
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what way does pressure act
pressure acts in a direcion of 90 degrees when you are standing on the ground
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how do you calculate pressure?
(N/m2)=force(N) divided by area(m2)
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pressure
force divided by area
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area
force divided by pressure
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force
area times pressure
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how do you measure pressure
unit newtons per meter squared
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equation for calculating the moment of force
moment (Nm) = force(N) x perpendicular istance from the pivot (M)
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## Other cards in this set

### Card 2

#### Front

how do you make the average speed?

#### Back

you make it by dividing the total distance by time that it took to run the race

### Card 3

#### Front

what do you need to calculate speed?

### Card 4

#### Front

how do you calculate the average speed?

### Card 5

#### Front

what does a distance time graph show us?