Vectors - have a magnitude and direction.
Scalar - only have magnitude and no direction.
Contact force - when two objects are touching for a force to act.
Non-contact force - objects do not need to be touching for the force to act.
Interaction pair - a pair of forces that are equal and opposite and act on two interacting objects.
Mass - the amount of 'stuff' in a object.
Weight - the force acting on an object due to gravity.
Gravitational Force - the force of attaction between masses.
Resultant Force - the overall force on a point or object.
Equilibrium - when the forces on an object are balanced.
Moment - the turning effect of a force.
Levers - increase the distance from the pivot at which the force is applied.
Gears - circular discs with 'teeth' that transmit rotational effects.
EQUATION Gravitational Field Strength
EQUATION Force applied to a spring
Watch the video and have a go at writing out the steps of the practical.