# Forces in Motion

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What is the equation that links average speed, distance and time?
Distance/time=average speed.
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What is speed measured in?
Metres per second.
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What is distance measured in?
Metres.
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What is time measured in?
Seconds.
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What is velocity?
Speed in a given direction.
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What is the equation that links acceleration with velocity change and time?
Velocity change/time=acceleration
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What is acceleration measured in?
Metres per second squared.
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What is velocity measured in?
Metres per second.
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To calculate deceleration what do you do?
Calculate acceleration and then make the answer negative.
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What is a force?
A push or a pull.
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What is force measured in?
Newtons.
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What is a vector?
A movement in a specified direction.
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Give three examples of vectors.
Displacement, velocity and acceleration.
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What is a scalar?
A movement in an unspecified direction.
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Give five examples of scalars.
Distance, mass, energy, speed and work done.
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What is weight?
The amount of the force of gravity acting on an object.
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How much gravity has the Moon got?
1/6 of the Earth's.
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What is mass?
The amount of matter an object has.
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What is 1 kilogram equal to?
10 Newtons.
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Is the mass the same on the Earth as it is on the Moon?
Yes.
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What is weight measured in?
Newtons.
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What is mass measured in?
Kilograms.
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What is the equation that links gravitational acceleration with weight and mass?
Mass x gravitational acceleration = Weight
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What is gravitational acceleration measured in?
Metres per second squared.
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What is gravitational acceleration?
The acceleration on an object caused by force of gravity.
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What is terminal velocity?
When an object is still or at a constant speed because all the forces acting on it are equal.
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Is there resultant force when an object reaches terminal velocity?
No.
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What happens when a moving object speeds up?
The frictional forces acting upon it increase.
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What 2 things affect stopping distance?
Thinking distance and braking distance.
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What factors affect thinking distance?
Age, tiredness, drugs or alcohol and speed.
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What factors affect braking distance?
Speed, the mass of the vehicle, the condition of the tyres and brakes, weather and the road condition.
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On a distance/time graph if the line is steep what is the speed?
Fast.
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On a distance/time graph if the line is curving up what is the speed?
Accelerating.
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On a distance/time graph if the line is curving down what is the speed?
Decelerating.
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On a distance/time graph if the line is not steep what is the speed?
Slow.
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On a distance/time graph if the line is diagonally going right what is the speed?
They are returning to their destination.
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## Other cards in this set

### Card 2

#### Front

What is speed measured in?

#### Back

Metres per second.

### Card 3

#### Front

What is distance measured in?

### Card 4

#### Front

What is time measured in?

### Card 5

#### Front

What is velocity?