# p3 forces for transport

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What is speed?
it is the distance something has travelled in, in a certain time.
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What is the equatiopn for speed?
average speed = distance / time
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What are the units of speed?
m/s (metres per second)
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A car travels at 390km in 3 hours what is its speed?
130 m/s
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Why do speed cameras take 2 photos?
one when they enter the speed check and one when you leave. To calculate the distance traveled.
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What is the breaking distance?
The distance taken to stop once breaks have been applied.
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What is the thinking distance?
It is the distance between when breaking needs to happen to when breaking starts.
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What is work done?
It is when a force makes an object move.
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What 2 things affect the work done?
one is the size of the force and the other is the distance it has moved.
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What 2 forces act on a falling object?
gravity and air-resistance.
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Describe the energy transfer for a roller coaster at the top of a ride?
At the top of the ride the cart has a lot of gravitational potential energy.
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What is the equation for work done?
work done = force X distance.
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What is gravitational potential energy?
it is energy due to height.
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What is the equation for gravitational potential energy?
gravitational potential energy = mass X gravity X height
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What is the main advantage of having electric cars over petrol and diesel cars?
it helps global warming as we do not produce green house gases when driving.
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What is kinetic energy?
it is the energy of movement.
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What is equation for kinetic energy?
kinetic energy = 1/2 X mass X speed(2)
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What affects kinetic energy?
it depends on the mass and the speed.
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Name 4 safety features of a car that aborbs keetic energy when a car stops suddenly?
the breaks heat up, the seat belts stretch, the air bag stops the person gradually and the crumple zone changes shape.
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What 3 things does an air-bag do?
They change shape, they stop people from hitting the hard surface and they slow people down gradually?
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What are passive safety features?
There are indirectly increase the saftey of a car--- they make the driver concentrate more for example electric windows.
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## Other cards in this set

### Card 2

#### Front

What is the equatiopn for speed?

#### Back

average speed = distance / time

### Card 3

#### Front

What are the units of speed?

### Card 4

#### Front

A car travels at 390km in 3 hours what is its speed?

### Card 5

#### Front

Why do speed cameras take 2 photos?