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15 Cards in this Set

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dynamic
the branch of physics that is concerned
with the motion of an object and the relationship of this motion to such physical concepts as force and mass
Define:

kinematics
part of dynamics that describes motion without regard to the causes
Define:

frame of reference
choice of coordinate axes that defines your starting point for measuring any quantity
Define:

displacement
the difference between the final and initial position
Define:

vector quantity
a physical quantity that must be characterized by both a magnitude and a direction
Define:

scalar quantity
a physical quantity that has magnitude, but not direction
Define:

average velocity
the displacement divided by the time interval during which the displacement occurred
Define:

speed
the total distance divided by the time of the total distance
Define:

instataneous velocity
the velocity of an object at one moment in time
Define:
instataneous speed
scalar quantity--defined as the magnitude of instataneous velocity
Define:

average acceleration
defined as the change in velocity divided by the time interval during which that change occurred
What happens when the object's velocity and acceleration are in the same direction
the speed of the object increases with time
What happens when the object's velocity and acceleration are in opposite directions
the speed of the object decreases with time
Define:

instataneous acceleration
at any time is the slope of the velocity-time curve at that instant
What does this mean on a graph?

v^2=vi^2=2ax
The area under any curve on a velocity-time graph is equal to the object's displacement