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# L1 Mechanics

### Definitions for mechanics AS90940

TermDefinition
Distance A measure of how far an object has travelled or the amount of space between two objects.
Time A measure of how long an object has been travelling for.
Speed A measure of how far an object has travelled in a certain amount of time.
Velocity The speed of an object in a given direction.
Acceleration The rate of change of velocity or speed per unit of time.
Deceleration The rate of decreasing velocity or speed per unit of time.
Distance-time graph A graph used to show the distance an object has travelled over a period of time. Used to determine the speed of an object.
Speed-time graph A graph used to show the speed an object has travelled over a period of time. Used to determine the distance an object has travelled.
Force A push, pull or a twist.
Balanced Force Occurs when the total of all forces on an object equal zero and the object's motion does not change.
Unbalanced Force Unbalanced forces cause a change in motion in an object because the forces acting on the object are not equal.
Newton The SI unit for forces.
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. It is a force that always opposes the movement of an object.
The resistance that one surface or object encounters when moving over another. It is a force that always opposes the movement of an object. A force that opposes motion of an object through a fluid [liquid or gas].
Pressure Force per unit area.
Pascal [Pa] The SI unit of pressure, equal to one newton per square metre.
Energy Energy is 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 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. Calculated using the formula W=Fxd. Measured in Joules.
Power Is the rate of doing work, or the rate of transfer of energy to that object. It is calculated using the formula P=W/t. Measured in Watts.
Watt The SI unit of power.
Created by: kjsime