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Junior Cert - Physics
Terms in this set (64)
Area is the amount of surface enclosed within boundary lines.
This is the splitting up of white light into separate colours. It can be done by passing white light through a prism.
Energy is the ability to do work.
An object that is balanced is said to be in equilibrium.
Force = Mass x Acceleration (F = ma)
A force is that which causes a change in the velocity of an object.
Formula for Power
Power = Voltage x Current (P = VI)
Formula for Voltage
Voltage = Current x Resistance (V = IR)
formula for wave velocity
Velocity = Frequency x Wavelength
Formula for weight
Weight = Mass x Acceleration due to gravity
This is the changing of a liquid to a solid state.
This is the number of waves that pass a particular point in onesecond.second.
This is a force which opposes motion between two objects in contact.
A fuse is a safety device in an electric circuit. If the current gets too high thewire in the fuse melts which breaks the circuit switching off the current.
A large group of stars held together by its own gravity.
Heat is a form of energy.
This is a substance, which does not allow heat to flow through easily.
This is the heat absorbed or released when a substance changes statewithout changing temperature
Law of conservation of energy
Energy cannot be created or destroyed but can beconverted from one form to another.
Law of the lever
When a lever is balanced the sum of the clockwise moments isequal to the sum of the anti clockwise moments.
A lever is a rigid body, which is free to turn about a fixed point called the fulcrum.
Light is a form of energy.
The loudness of a sound depends on the amplitude
A lubricant is a substance capable of reducing friction.
A luminous object is an object that gives out light.
This happens when the earth passes between the sun and the moon.
A space around a magnet in which the magnetism can be detected.
The mass of an object is the quantity of matter in it.
This is the changing of a solid to a liquid state.
This is a measure of the turning effect of a force. Formula: Moment of a Force = Force x Perpendicular distance from the fulcrum.
Newton's third law of motion
For every action there is an equal but opposite reaction.
At constant temperature the voltage across a conductor is proportionalto the current flowing through it
Pitch of a sound
The pitch of a sound is how high or low it is. It depends on the frequency ofthe wave.the wave.
Potential difference is also called voltage. It is the force,which moves the electrons around the circuit.
This is the rate at which energy is converted from one form to another.
Pressure is force per unit area.
The primary colours are red, green and blue. When the three ofthese colours are combined it results in white.
This is the transfer of heat by means of invisible rays, which traveloutwards from the hot object, without needing a medium.
This is used to convert alternating current to direct current.
The reflection of light is the bouncing back of light from a surface.
The refraction of light is the bending of light as it passes from onemedium to another.
The opposition of a conductor to current is called its resistance. A good conductor has a low resistance and a bad conductor has a high resistance.
A secondary colour is formed when two primary colours are mixed. The three secondary colours are yellow, magenta and cyan.Red + Green = YellowRed + Blue = MagentaBlue + Green = Cyanmixed.
This happens when the moon passes between the sun and the earth.
Sound is a form of energy.
Speed is the distance travelled per unit time.Formula distance / time (m/s)
A body is in stable equilibrium if when slightly moved itscentre of gravity rises.
This is the changing of a solid directly to a gas.(Iodine is an example of a substance that sublimes).
This is a measure of how hot an object is.
Unit for potential difference
Unit of Force
Unit of Heat
Heat is mesured in Joules, J
Unit of Power
Unit of pressure
or Pascal (Pa)
Unit of Resistance
Unit of temperature
degrees Celsius ( )
Units of velocity
A body is in unstable equilibrium if when slightly movedits centre of gravity falls.its centre of gravity falls.
Speed in a given direction.
The volume of an object is the amount of space it takes up.
A wave is a means of transferring energy from one point to another.
The wavelength of a wave is the distance between any two successive crests.
Weight is the force of gravity on an object.
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