||a push or pull on an object
||a push or pull applied by one object to another object that is touching it
||a force that pushes or pulls an object without touching it
||a contact force that resists the sliding motion between two objects that are touching
||a noncontact attractive force that exists between all objects that have mass
||when the net force on an object is 0 N, the forces acting on it are balanced forces
||when the net force acting on an object is not 0, the forces acting on the object are unbalanced forces.