Mechanics Definitions

Question	Answer
Distance	The measurement between two points measured in metres
Time	Measured in seconds or multiples of
Speed	Measured distance divided by time elapsed. Measured in km per hour
Velocity	Ms-1 Measured distance divided by time elapsed in seconds
Acceleration	Anything where there is a change in speed. Measured in change of velocity over time
Deceleration	Negative acceleration
Distance-time graph	Graph representing change in distance over time
Speed-time graph	Graph representing change in speed over time
Force	A push, pull or twist and is measured in Newtons (N)
Balanced Forces	No net force. If the object is moving it is moving at a constant speed. If it is not moving it will remain stationary
Unbalanced Forces	There is a net force and the object will accelerate or decelerate
Newton	The SI unit for forces; named after Sir Isaac Newton
Thrust	To push an object in a particular direction
Mass	The amount of matter inside an object
Weight	The effect of gravity on an object's mass
Friction	The resistance that one surface or object encounters when moving over another. The force that opposes movements of an object
Drag	A force that opposes movement/motion of an object through a fluid
Pressure	Force per unit area
Pascal (Pa)	The SI unit of pressure equal to one unit per square Newton
Energy	The ability to do work
Joule	The SI unit of work or energy
Gravitational Potential Energy	The energy stored in an object due to its height above the Earth
Kinetic Energy	The energy of an object due to its motion
Work	When force moves an object, resulting in the transfer of energy to that object. Measured in joules
Power	The rate of doing work, or the rate of transfer of energy. Measured in Watts
Watt	The SI unit for power

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Mechanics Definitions

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	Created by mckenziedev over 11 years ago