# P3

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What is the gradient on a distance - time graph?

The gradient on a distance - time graph is the speed

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When the gradient is steeper, what happens to the speed?

The steeper the gradient, the higher the speed

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How do you work out distance?

Distance = average speed x time

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How do you work out acceleration?

Acceleration = change in speed / time

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What is relative velocity?

Relative velocity is the difference between the velocities of two bodies having regard to their direction

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What is the area under a speed - time graph?

The area under a speed - time graph is the distance travelled

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What is the gradient on a speed - time graph?

The gradient on a speed - time graph is the acceleration

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What does a negative gradient mean?

A negative gradient means the body is slowing down

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What do forces always occur in?

Forces always occur in pairs that are: the same size, act in opposite directions, act on different objects

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What can forces do?

Forces can make things speed up or slow down

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How do you work out force?

Force = mass x acceleration

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How do you work out weight?

Weight = mass x gravitational field strength

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How do you work out the total stopping distance when a car stops?

Total stopping distance = thinking distance + braking distance

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What does thinking distance depend on?

Thinking distance depends on the state of the driver and the speed of the vehicle (linear)

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What does braking distance depend on?

Braking distance depends on the state of the road, vehicle and speed (squared)

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What do moving objects possess?

Moving objects possess kinetic energy

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How do you work out kinetic energy?

KE = 1/2 mv2

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What does fuel consumption depend on?

Fuel consumption depends on the energy required to increase kinetic energy

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What do roller coasters use as the source of movement?

Roller coasters use gravitational potential energy as the source of movement

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What happens to GPE (Gravitational potential energy) during a roller coaster ride?

During a roller coaster ride, GPE is transferred into KE and back again

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When is work done?

Work is done when a force moves through a distance

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What is power a measure of?

Power (W) is a measure of how quickly work is done

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How do you work out work done?

Work done = force x distance

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How do you work out power (related to rate at which work is done)?

Power = work done / time

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How do you out power (related to force and speed)?

Power = force x speed

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Name three safety features that a modern car has.

Crumple zones, seat belts, air bags

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How do you work out force (to do with cars)?

Force = change in momentum / time

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What can reduce injury?

Spreading momentum change over a long period of time reduces injury

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What do ABS breaks allow?

ABS brakes mean the driver can keep control when breaking without skidding

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What is terminal speed?

Terminal speed is the maximum speed reached by a falling object

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When does terminal speed happen?

Terminal speed happens when the forces acting on the object are balanced

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Why do falling objects get faster as they fall?

Falling objects get faster as they fall because they are pulled towards the center of the earth by their weight

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What is the same at any point on the Earths surface?

The acceleration is the same at any point on the Earths surface

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Two things that forces on a falling object depend on?

The speed of the object (higher speed means more drag), the area of the object (larger area means more drag)

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What happens to its kinetic energy when the car stops?

When the car stops, its kinetic energy turns into heat in the brakes, tyres and road

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Three things that affect reaction time (thinking distance)?

Tired, under the influence of drugs or alcohol, travelling faster

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Three things that affect braking distance?

Poor road conditions, the car has not been properly maintained, the speed is increased

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## Other cards in this set

### Card 2

#### Front

When the gradient is steeper, what happens to the speed?

#### Back

The steeper the gradient, the higher the speed

### Card 3

#### Front

How do you work out distance?

#### Back

### Card 4

#### Front

How do you work out acceleration?

#### Back

### Card 5

#### Front

What is relative velocity?

#### Back

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