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# Physics

### Chapter 4

kinematics the study of motion without regard for what is causing it
dynamics the study of motion and it's causes
vector magnitude and direction (lineray-arrow)
force (N) a push or a pull
Newtons 1st Law of Motion an object at rest remains at rest, an object in motion remains in motion, unless acted by an outside net force (some push/pull)
Newtons 2nd Law of Motion -the acceleration of an object is directly related to the net force acting on the object provide the mass stays a constant -the acceleration of an object is inversely related to the mass of the object provided we hold the force
Newtons 3rd Law of Motion -for every action there is an equal and opposite reaction -the forces are equal and opposite but they do not cancel because they act on different thing
weight {w(fg)} force due to gravity (downward force)
net force (ΣF) -sum total of forces causing acceleration -FBD: not attached to the object
normal force (FN) the upward supporting force on an object almost always equal to the weight (vertical acceleration, 2 dimensions)
applied force (fa) force acting on the object in the direction of the motion
opposed force (fo) force acting on the object in the direction opposite to motion
frictional force (ff) force between surfaces in contact that always opposes motion
Created by: Hellokitty139