Force and Motion-module 4.1

acceleration

rate at which an objects velocity changes

force

A push or a pull exerted on an object; has both direction and magnitude and may be a contact or a field force

system

Object or objects of interest that can interact with each other and the external world.

free body diagram

a physical representation that shows the forces acting on a system

field force

a force that is exerted without contact, This force affects the book whether or not Earth is actually touching it; ex= gravitational force

System

Object or objects of interest that can interact with each other and the external world

net force

The vector sum of all the forces on an object

newton’s first law

States that an object at rest will remain at rest and a moving object will continue moving in a straight line with constant speed, if and only if the net force acting on that object is zero

newton’s second law

States that the acceleration of an object is proportional to the net force and inversely proportional to the mass of the object being accelerated

inertia

The tendency of an object to resist changes in velocity

contact force

this force exists when an object from the external world touches a system, exerting a force on it. If you are holding this physics textbook right now, your hands are exerting this force on it