# Junior Cert Physics HL Terms

• Volume – How much space an object takes up
• Speed – The distance travelled by an object in
one unit of time
• Centre of gravity of an object – Is a point in the object through which all the weight of
the object appears to act.
• Pressure – Is the force acting on a
unit of area.
• Power – The rate at which work is done.
• Energy – The ability to do work
• Heat – A form of energy measured in Joules
• Latent heat – Causes a change in state and not a change in temperature
• Velocity – The speed of an object and
the direction in which it is travelling.
• Acceleration – The change in speed divided
by the time taken
• The light-dependent resistor (LDR) – A resistor whose value of resistance can change
as the intensity of the light falling on it
changes.
• The light-emitting diode (LED) – A diode that gives out light when current passes
through it.
• Diode – Allows an electric current to flow in
one direction only.
• Law of the lever – When a lever is balanced
the sum of the clockwise moments equals
the sum of the anticlockwise moments
• Alternating current (a.c.) – A current that flows in a continually changing direction.
• Direct current (d.c.) – A current that flows in one direction only.
• Lever – A rigid body that can turn about a fixed point called a fulcrum.
• Hooke’s law – The extension of an elastic body (a spring) is directly proportional to the force causing the extension.
• Conductor – A material through which charge can flow.
• Insulator – A material through which charge cannot flow.
• Lubrication – Used to reduce the friction between two surfaces in contact.
• Magnetic field – The region around a magnet in which the magnetic force can be detected.
• Friction – A force that opposes the sliding motion of an object when in contact with another object.
• Magnetic force – The force of attraction or the force of repulsion between two magnets
• Force – Causes a stationary object to move.
• Sound – Produced when objects vibrate.
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