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15 Cards in this Set
- Front
- Back
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dynamic
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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 |
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Define:
kinematics |
part of dynamics that describes motion without regard to the causes
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Define:
frame of reference |
choice of coordinate axes that defines your starting point for measuring any quantity
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Define:
displacement |
the difference between the final and initial position
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Define:
vector quantity |
a physical quantity that must be characterized by both a magnitude and a direction
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Define:
scalar quantity |
a physical quantity that has magnitude, but not direction
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Define:
average velocity |
the displacement divided by the time interval during which the displacement occurred
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Define:
speed |
the total distance divided by the time of the total distance
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Define:
instataneous velocity |
the velocity of an object at one moment in time
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Define:
instataneous speed |
scalar quantity--defined as the magnitude of instataneous velocity
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Define:
average acceleration |
defined as the change in velocity divided by the time interval during which that change occurred
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What happens when the object's velocity and acceleration are in the same direction
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the speed of the object increases with time
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What happens when the object's velocity and acceleration are in opposite directions
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the speed of the object decreases with time
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Define:
instataneous acceleration |
at any time is the slope of the velocity-time curve at that instant
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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
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