# Physics (Mechanics)

Definaition for ocr a Physics as

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• Created by: Lewis
• Created on: 13-11-11 19:38

## Acceleration

The rate of change of an objects velocity.

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## Breaking distance

The distance travelled by a vehicle from the moment when brakes are applied untill the vehicle comes to a stop.

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## Centre of gravity

The point where the entire weight of an object appears to act.

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## Density

The mass per unit volume of material.

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## Displacement

The distance moved by an object in a particular direction (measured from a fixed starting point).

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## Effiiciency

Useful output energy/ total input energy x 100

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## Equilibrium

The net forces acting on the object are equal to zero.

The torque of the object is equal to zero.

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## Newton

The force that will give a 1KG mass an acceleration of 1 ms^-2.

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## Moment

The moment of a force about a point is the magnitude of the force, multiplied by the perpendicular distance of the point from the line of the force.

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## Power

The rate at which energy is transferred or the rate at which work is done.

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## Pressure

The force acting normally per unit area of surface. p=F/A

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## Stopping distance

The sum of the braking distance and the thinking distance.

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