Displacement (s): Distance travelled in a particular direction (change in position)

Newton's first law of motion: An object at rest remains at rest and an object in motion remains in motion at a constant speed in a straight line unless acted on by an unbalanced force.

Newton's second law of motion: An unbalanced force will cause an object to accelerate in the direction of the net force. The acceleration of the object is proportional to the net force and inversely proportional to its mass.

Newton's third law of motion: When two bodies A and B interact (push or pull), the force that A exerts on B is equal and opposite to the force that B exerts on A.

Translation equilibrium: The net force acting on a body is zero

Momentum (p): Product of mass and velocity. Sometimes called "linear momentum".

Law of conservation of momentum: The total momentum of an isolated system (no external forces) remains constant.

Work (W): The product of a force on an object and the displacement of the object in the direction of the force.

Kinetic energy (EK): Product of 1⁄2 times the mass of an object times the square of an object’s speed

Gravitational potential energy (EP): Product of an object’s mass times the gravitational field strength times the change in height

Principle of Conservation of Energy: The total energy of an isolated system (no external forces) remains constant. or.. Energy can be neither created nor destroyed but only transformed from one form to another or transferred from one object to another.

Elastic collision: A collision in which kinetic energy is conserved

inelastic collision: A collision in which kinetic energy is not conserved

Power (P): The rate at which work is done or the rate at which energy is transferred

Efficiency (EFF): The ratio of the useful energy (or power or work) output to the total energy (or power or work) input