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Junior Cert Science

Junior cert physics

TermDefinition
Length the distance between two points
Mass the amount of matter an object contains
Volume how much space object takes up
Speed the distance travelled by an object in one unit of time
Velocity the speed of an object in any given direction
Acceleration the changes in space divided by the 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 subject
Lubrication used to reduce friction between 2 surfaces in contact with another subject
Weight the PULL of the earth on an object
Hookes 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 equals the sum of its anticlockwise moments
Centre of gravity a pint in an object where all its weight appears to act
Pressure the amount of force acting on a unit of area
Work force by distance
Power the rate at which work is done
Energy the ability to do that work
Latent Heat energy that causes a change in state and not in temperature
Dispersion the spreading of light into its different colours
Reflection the bouncing off light
Refraction the BENDING of light as it passes from one medium to another
Sound produced when a n object vibrates
Magnetic Force the force of attraction OR repulsion between 2 magnets
Magnetic Field the region around a magnet in which te magnetic force can be detected
Insulator a material through which a charge can flow
Conductor a material through which charge can flow
Direct Current D.C a current flows in one direction only
Alternating Current A.C a current that flows in a continually changing direction
Diode allows an electric current to flow in one direction only
LED LIGHT EMITTING DIODE, a diode that gives out light when a current passes through it
LDR LIGHT DEPENDENT RESISTOR, resistor who's value of resistance can change as the intensity of the light falling on it changes
Echo the reflection of sound
Ohms law voltage is directly proportioned to current
Created by: jojo1979
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