force - push or pull of an object, system - object of interest, external world - everything around the object that exerts a force on it, agent - specific and identifiable force cause, contact force - when an object from the external world touches the object and thereby exerts a force on it, field force - exerted without contact with the system , free body diagram - a physical representation that shows the forces acting on the system, net force - vector sum of all the forces exerting on an object , inertia - the tendency of an object to resist chnage in velocity, equilibrium - if the net force is zero, weight - gravitational force experienced by an object , gravitational field - a vector quantity that relates the mass of an object to the gravitational force it experiences at a given location, interaction pair - 2 forces that are in opposite directions, have equal magnitudes, and act on different objects, tension - force exerted by a string or rope , normal force - the perpendicular contact force exerted by a surface on another object,

Definitions - physics, second term midterm exam.

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