Physics Chapter 4 Summary

the basic classical laws describing motion

(Law of Inertia) states that if the net force of an object is zero, an object originally at rest remains at rest, and an object in motion remains in motion in a straight line with constant velocity

states that the acceleration of a body is directly proportional to the net force acting on it, and inversely proportional to its mass: (?F=ma); Newton's second law is one of the most important and fundamental laws in classical physics

states that whenever one body exerts a force on a second body, the second body always exerts a force on the first body which is equal in magnitude but opposite in direction: (F??=-F??);

the tendency of a body to resist a change in its motion

a measure of the inertia of a body

refers to the force of gravity on a body and is equal to the product of the body's mass m and the acceleration of gravity

F?G=mg

can be considered as a push or pull; or, from Newton's second law, can be defined as an action capable of giving rise to acceleration

the vector sum of all forces acting on it

In F?fr=µ?k F?N, F?N is the force that each body exerts on the other perpendicular to their contact surfaces)

In F?fr=µ?k F?N, µ?k is the coefficient

If the bodies are at rest relative to each other, then F?fr is just large enough to hold them at rest and satisfies the inequality F?fr<µ?s F?N, where µ?s is the coefficient