forces and Newtons law

Definitions

normal forces:the perpendicular force extended by a surface on an object in contact with it.

Weight: the gravitational force the earth exerts on or near its surface

Frictional force: the force that opposes the motion of an object and acts parallel to the surface with which the object is in contact.

Newton’s third law: when object A exerts a force on object B, object B simultaneously exerts an oppositely directed force of equal magnitude on object A.

Newton’s first law: an object continues in a state of rest or uniform (moving with constant) velocity unless it is acted upon by a net or resultant force

Inertia: the property of an object that causes it to resist a change in its of rest or uniform motion.

Newton’s second law: when a Fnet, is applied to an object of mass, m, it accelerates in the direction of the net force. The acceleration, a,is directly proportional to the net force and inversely proportional to the mass