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Physics
Chapter 4
Question | Answer |
---|---|
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 |