Grade 12 IEB definitions Physics 2023 Update

Grade 12 IEB definitions Physics 2023 Update Freefall - ANS-when the only force acting on an object is gravity conventional current - ANS-Current that flows from the positive side of the battery to the negative side motor effect - ANS-The motor effect is where a current carrying wire (or any other conductors) is put between magnetic poles, the magnetic field around the wire interacts with magnetic field it has been placed in. This causes the magnet and the conductor to exert forces on each other causing the wire to move either up or down Commutator - ANS-A device that controls the direction of the flow of current through an electric motor split ring commutator - ANS-A ring with gaps in it that swaps the electrical contacts of a device every half-turn. Slip ring commutator - ANS-Used to connect the external circuit to the rotating coil in an AC electric generator. alternating current - ANS-an electric current that reverses its direction many times a second at regular intervals, typically used in power supplies. Direct Current (DC) - ANS-Electric current that flows in only one direction kinetic energy - ANS-the energy an object has due to its motion work-energy theorem - ANS-The work done on an object equals the change in kinetic energy of the object Newton's Second Law - ANS-a net force acting on an object causes the object to accelerate in the direction of the net force Newton's Third Law - ANS-Every action has an equal and opposite reaction Newton's First Law - ANS-An object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force. Continues...