Physics (Chapter 4)

A pair of simultaneous equal but opposite forces resulting from the interaction of two objects

the ratio of the force of friction to the normal force acting between two objects

force that arises from the physical contact of two objects

the state in which there is no change in a body's motion

forces that can exists between objects, even in the absence of physical contact between the objects

the cause of an acceleration or the change in an objects velocity

a diagram of the objects invovled in a situation and the forces exerted on the objects

the tendency of an object to maintain its state of motion

the restive force that opposes the relative motion of two contacting surfaces that are moving

the total force resulting from a combination of external forces on an object; sometimes called the resultant force

a force exerted by one object on another in a direction perpendicular to the surface of contact

the resistive force that opposes the relative motion of two contacting surfaces that are at rest with respect to one another

the magnitude of the force of gravity acting on an object

Weight, unlike mass, is not an permanent  property of an object. Weight is dependent on force of gravity.

• an object at rest remains at rest, and an object in motion remains in motion unless the object experiences a net external force

• The acceleration of an object is directly proportional to the net external force acting on the object and inversely proportional to the object's mass

• For ever action there is an equal and opposite reaction