# OCR AS Mechanics Definitions

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Acceleration
Acceleration is the rate in change of velocity
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Braking Distance
Braking distance is the distance travelled between applying pressure to the brakes and the car stopping
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A Brittle Material
A material that has no plastic region, and breaks at an elastic limit
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Centre of gravity
The pount where and objects entire force acts
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A couple
A pair of equal and opposite forces seperated by a distance
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Density
The mass per unit volume
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Elastic Limit
The point after which a material does not return to its origional shape after the applied force is removed
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Equillibrium
The net force acting on the object is 0.
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State Hooke's Law
The extension of a spring is directly proportional to the force applied to it.
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the Newton
The force required to accelerate a 1km mass to 1ms
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Plastic Deformation
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Power
The rate at which work is done
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Pressure
The force per unit cross sectional area
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Principle of Conservation of Energy
Energy cannot be created or destroyed, only transformed
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Principle of a moment
The clockwise moments = anticlockwise moments
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Scalar Quantity
A quanitity with only magnitude
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Special Theory of Relativity
The mass of an object increases as it approaches the speed of light
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Speed
The rate in change of distance
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Stopping Distance
Thinking distance + Braking Distance
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Stress
The deformation per unit of the origional length
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Terminal Velocity
The maximum velocity that an object will experience in free-fall, as its weight is equal to the drag
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Thinking Distance
The distance travelled by the car between seeing an obstacle and pressing the brake
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Torque of a Couple
One of the forces x the perpendicular distance between the forces
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Ultimate Tensile Strength
The breaking stress for a material
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Vector
A quanitity with both magnitude and direction
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Velocity
The rate in change of displacement
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The Watt
The transfer of energy of one joule per second
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Word done by a force
Force x distance travelled in the direction of the force
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Young's Modulus
Stress/Strain
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## Other cards in this set

### Card 2

#### Front

Braking distance is the distance travelled between applying pressure to the brakes and the car stopping

Braking Distance

### Card 3

#### Front

A material that has no plastic region, and breaks at an elastic limit

### Card 4

#### Front

The pount where and objects entire force acts

### Card 5

#### Front

A pair of equal and opposite forces seperated by a distance