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# Mechanics Def'ns

### MechanicsDefinitions

TermDefinition
Physical Quantity A quantity that can be measured, or calculated, and expressed in numbers
Scalar Quantity A quantity with magnitude only, not direction
Distance A measure of how far one point is from another
Displacement An object's overall change in position
Time Used to measure the duration of an event or the interval between events
Speed Rate of change of distance with respect to time
Vector Quantity A quantity with both magnitude and direction
Velocity Rate of change of displacement with respect to time
Acceleration Rate of change of velocity with respect to time
Mass A measure of the amount of matter in a body
Momentum The product of mass and velocity
Force That which causes acceleration
Acceleration due to gravity The acceleration experienced by a body in free fall within the gravitational field of a massive body
Weight A force equal to the product of mass and acceleration due to gravity
Centre of gravity The point at which the whole weight of a body appears to act
Friction A force that opposes the motion of a body
Moment of a Force The force multiplied by the perpendicular distance to the fulcrum
Lever A rigid body that is free to rotate about a fixed axis
Couple A pair of equal and opposite forces whose lines of action do not coincide
Torque of a Couple Product of the magnitude of one of the forces and the distance between the two forces
Density Mass per unit volume
Pressure Force per unit area
Buoyancy Upward force on a body that is wholly or partly immersed in a fluid
Work Product of force and displacement
Energy Ability to do work
Kinetic Energy Energy a body has due to its motion
Potential Energy Energy a body has due to its position
Power Rate at which work is done
Radian A measure of angle found by dividing arc length by radius
Angular Velocity Rate of change of angle with respect to time
Linear Velocity Rate of change of displacement with respect to time in a direction perpendicular to the radius at that point
Periodic Time Time taken for one complete revolution, cycle or oscillation
Centripetal Acceleration Acceleration of an object travelling in uniform circular motion, directed towards the centre of the circle
Centripetal Force Force required to keep up uniform circular motion, directed towards the centre of the circle
Elastic Constant Constant of proportionality between force applied and the resulting displacement of spring/elastic string
Elasticity Ability of a body to resist a distorting influence or stress and to return to its original shape and size when the stress is removed
Simple Harmonic Motion When the acceleration of a body towards a particular point is proportional to displacement away from that point
Amplitude Maximum distance an object moves away from its equilibrium position
Frequency Number of revolutions, cycles or oscillations an object completes per unit time
Period of SHM Time taken for one complete revolution, cycle or oscillation
Created by: conordesmond