force

any push or pull

normal force

the perpendicular force that is the contact surface pushing up on the object

magnitude

a measure of how much

tension

the force applied due to a rope or wire.

inertia

the tendency of an object to resist any change in its motion

Newton's First Law

An object will resist change in motion if moving or resting.

friction

force that opposes motion

Newton's Second Law

Objects will accelerate in direct proportion to the force applied to the object

Newton's Third Law

For every action there is an equal but opposite reaction

weight

force of gravity on masses

mass

the amount of matter in an object

balanced forces

forces that add up to zero acceleration and/or no motion

unbalanced forces

forces that produce acceleration

vector

has magnitude and direction

acceleration

change in velocity

net force

The sum of all the forces acting on an object.