Force is equal to mass times acceleration
An object at rest remains at rest as long as no net force acts on it
A push or a pull
For every action force acting on an object, there is a reaction force acting on a different object
A force that opposes the motion of one surface past another
The tendency of an object to resist any change to its motion
A force exerted perpendicular to the surface of contact
The force exerted by by a string, rope or wire that is pulled tight
The sum of the individual forces acting on an object
A measure of the gravitational force acting on an object
A sketch that shows all the forces acting on an object
A state in which an object has zero acceleration and is subject to zero net force