Junior Cert Physics HL Terms

Junior CertificateScienceHL

  • 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
  • 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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