The following includes all the required physics definitions in:
Kinematics
Newton’s laws
Momentum, Impulse, work, energy & power
Gravitational & Electrical fields
Electrical circuits
Electrodynamics
Photons and electrons
SAGS physics definitions
Kinematics
1. Vector: physical quantity that has both magnitude and direction
A scalar quantity: physical quantity that has magnitude only
Resultant vector: the single vector which has the same effect as the original vectors acting
together
2. Distance: length of path travelled
Displacement: a change in position
Speed: the rate of change of distance
Velocity: the rate of change of position/rate of displacement/ rate of change of displacement
Acceleration: the rate of change of velocity
Newton's Laws and Application of Newton's Laws
1. Weight Fg: the gravitational force the Earth exerts on any object on or near its surface
Normal force FN: the perpendicular force exerted by a surface on an object in contact with it
Frictional force due to a surface Ff: the force that opposes the motion of an object and acts
parallel to the surface with which the object is in contact
3. Newton's first law: An object continues in a state of rest or uniform (moving with constant)
velocity unless it is acted upon by a net or resultant force
Inertia: the property of an object that causes it to resist a change in its state of rest or
uniform motion
Newton’s second law: When a net force, Fnet, is applied to an object of mass, m, it
accelerates in the direction of the net force. The acceleration, a, is directly proportional to the
net force and inversely proportional to the mass
Newton’s third law: When object A exerts a force on object B, object B simultaneously exerts
an oppositely directed force of equal magnitude on object A
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