# science P3

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• Created by: emwatson
• Created on: 15-11-15 14:36
How do you measure speed?
average speed=distance ÷ time
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What does the gradient tell us on a distance time graph ?
about the speed of the object. e.g a higher speed = steeper gradient
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what is a change of speed per unit called?
acceleration
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formula of measuring acceleration
acceleration= change in speed(or velocity) ÷ time taken
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why might reaction time increase ?
tired , under the influence of alcohol , travelling faster, distracted
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why might braking distance increase ?
road conditions poor, car hasn't been properly maintained e.g worn brakes , speed increased
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what is work done?
when a force moves an object in the direction in which the force acts.
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what is the formula for work done?
work done= force × distance moved ( in the direction of the force)
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name some safety features within a car.....
crumple zone, seat belts , air bags
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what is terminal speed?
maximum speed reached by a falling object. This happens when the forces acting on the object are balanced
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## Other cards in this set

### Card 2

#### Front

What does the gradient tell us on a distance time graph ?

#### Back

about the speed of the object. e.g a higher speed = steeper gradient

### Card 3

#### Front

what is a change of speed per unit called?

### Card 4

#### Front

formula of measuring acceleration

### Card 5

#### Front

why might reaction time increase ?