# P3 - Changing Speed

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Define acceleration
The rate of change of velocity of an object
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In a speed-time graph, what is the area under the line equal to?
The distance travelled
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What is the formula for measuring acceleration?
change in speed/time taken
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What is acceleration measured in?
Metres per second squared (m/s^2)
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What is velocity a vector of?
Size(speed) and direction
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How do you work out the relative velocity of two cars moving in opposite directions?
The sum of their individual velocites
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How do you work out the relative velocity of two cars moving in the same direction?
The difference of their individual velocities
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Why does a driver travelling a constant speed around a roundabout actually accelerate?
The direction of travel is changing, it is not going in a straight line. The driver needs to apply a force tot he centre of the roundabout to change direction. This gives the vehicle an acceleration towards the centre of the roundabout.
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## Other cards in this set

### Card 2

#### Front

In a speed-time graph, what is the area under the line equal to?

#### Back

The distance travelled

### Card 3

#### Front

What is the formula for measuring acceleration?

### Card 4

#### Front

What is acceleration measured in?

### Card 5

#### Front

What is velocity a vector of?