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A scalar is a physical property with magnitude but not direction. Another word for magnitude is size. Examples of scalars include speed, distance, temperature and wavelength 


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This is a quantity that has both size and direction. Another word we can use for size is called magnitude. Examples are velocity, force, acceleration and electric current. 


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This is the distance travelled in a particular direction. The unit for distance is the metre. 


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Th is is the speed of an object at a moment in time. A cars speedometer gives the driver an instantaneous speed. 


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A measure of the total distance travelled in a unit time. 


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The velocity of a moving object is its displacement per unit time 


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The acceleration of an object is its rate of change of velocity 


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The Newton is the unit of force. 1 N is the force which gives a mass of 1 Kg an acceleration of 1 ms^2 


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This is the turning effect due to a couple. It is measured in Newton metres (Nm). 


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The moment of a force is the turning effect due to a single force. It is calculated by multiplying the force by the perpendicular distance from a given point. The units are Newton metres. (Nm) 


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This is the distance travelled by a vehicle from seeing the need to stop to applying the brakes 


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The distance a vehicle travels while decelerating to a stop. This is the distance travelled after the brakes have been applied. 


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The stopping distance is the thinking distance added to the braking distance. 


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The product (multiplied together) of a Force and the distance moved in the direction of the force gives the work done by the force. It can also be thought of as the energy converted from one form into another. The units for work done are Joules. (J) 


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This is the unit of energy. 1 Joule is the work done when a force of 1 N moves its point of application 1 m in the direction of the force. 


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Power it the rate at which work is done. It is measured in Watts (W). 


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This is the unit of power. One watt is equal to one joule per second. 1 W = 1 JS^1 


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This is the force per unit cross  sectional area. It is measured in Nm  2 or Pascals (Pa). 


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This is the extension per unit length . It has no units 


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This is the ratio between stress and strain i.e. the stress divided by the strain. It has the same unit s as stress namely Newton metres squared ( Nm  2 ) or Pascal (Pa) 


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This is the maximum tensile ( stretching ) force that can be applied to an object before it breaks 


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This means that t he object will return to its original shape when the deforming force is removed. 


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This means that t he object will not return to its original shape when the deforming force is removed, it becomes permanently deformed 

