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Physics Keywords

Keywords for junior cert physics

TermDefinition
Speed Distance travelled by an object in a unit of time
Velocity Speed of an object in a given direction
Acceloration Change in Speed/Time taken
Force Causes a stationary object to move
Friction A force that opposes the sliding motion of an object when in contact with another object
Lubrication Used to reduce friction between two substances in contact
Weight The pull of the earth on an object
Hooke's law The extension of an elastic body is directly proportional to the force causing the extension
Lever A rigid body that can turn about a fixed point called the fulcrum
Law of the lever When a lever is balanced the sum of its clockwise moments = the sum of its anti-clockwise moments
Centre of gravity A point in an object where all its weight appears to act
Pressure Amount of force acting on a unit of area
Work Force x Distance
Energy The ability to do work
Power Rate at which work is done
Latent Heat Change in state but not a change in temperature
Dispersion The spreading of light into its different colours
Reflection The bouncing of light off a surface
Refraction The bending of light as it passes through another medium
Sound A form of energy produced when particles in an object vibrate
Magnetic Force Force of attraction or repulsion between 2 magnets
Magnetic Field The region around a magnet in which the magnetic force can be detected
Insulator A material through which charge cannot flow
Conductor A material through which charge can flow
Alternating Current A current that flows in a continually changing direction
Direct current A current that flows in one direction only
Diode Allows current to flow
LED Light Emitting Diode
LDR Light Dependent Resitor
Ohm's Law Voltage is directly proportionate to current
Echo Reflection of sound
Created by: avrilking1