# Keywords

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Scalar
A quantity that only has magnitude. For example, time or speed.
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Vector
A quantity that has both magnitude and direction. For example, force or velocity.
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Displacements
The distance from one point to another.
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Instantaneous speed
The speed of an object at a specific point in time.
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Average speed
The average speed something travels between two points.
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Velocity
Speed in a given direction.
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Acceleration
The change in velocity over time.
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Newton
The net force which gives a mass of 1Kg an acceleration of 1m/s.
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Torque of a couple
one of the forces x perpendicular distance between the forces
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Moment of a couple
Force x perpendicular distance from the pivot
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Thinking distance
The distance traveled between seeing the danger and applying the brakes
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Braking distance
The distance the car travels once the brakes have been applied.
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Stopping distance
Thinking distance + Braking distance
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Work done
Force x distance moved in the direction of the force
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Joule
Energy required to move a weight of 1N a distance of 1m.
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Power
The rate of doing work
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Watt
The power required to move 1N through a distance of 1m in 1s.
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Stress
Force ÷ cross sectional area
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Strain
Extension ÷ original length
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Young's modulus
Stress ÷ Strain
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Ultimate tensile strength
Maximum stress a material can withstand before breaking.
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Elastic deformation
A temporary shape change that reverses once the force is removed.
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Plastic deformation
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## Other cards in this set

### Card 2

#### Front

A quantity that has both magnitude and direction. For example, force or velocity.

Vector

### Card 3

#### Front

The distance from one point to another.

### Card 4

#### Front

The speed of an object at a specific point in time.

### Card 5

#### Front

The average speed something travels between two points.

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