2-1: The 1ST Law of Motion

Terms	Definitions
type of change	Regardless of the ______________, something moves when change occurs.
If something changed	____________________, it or some part of it moved.
create motion	A force of some kind is necessary to _____________.
sustain motion	Force is not necessary to ______________ if we can get rid of other forces, like friction.
Newton's 1st Law	Every object at rest, or in uniform motion, will remain in that state unless compelled to do otherwise by forces acting upon it.
uniform motion	motion at constant speed in a straight line (also: unaccelerated motion).
Force	A push or pull.
State of Uniform Motion	The condition of an object when no unbalanced forces act upon it. A state of motion always refers to being at rest or in uniform motion.
may not be obvious	The First Law __________________ because the objects we deal with in everyday life are not free from the influence of forces, like gravity and friction.
state of rest	The _____________ is simply the special case of uniform motion when the speed is zero.
Velocity	The speed in a particular direction of a moving body. Speed + direction.
Acceleration	Rate of change of velocity per unit time, or change of velocity divided by the time required for the change. Speed + direction OVER time.
Centripetal	Toward a center.

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