VELOCITY-TIME GRAPHS
VELOCITY-TIME GRAPHS
Recall…
Acceleration (the scalar quantity) is the change in _________ over _________, noted by the symbol, ____.
The slope of a speed-time graph represents ________________
Acceleration can also be represented as a ________ quantity
( It is calculated as the change in _________ over _______
( Has a ____________ associated with it
( Designated by the symbol ______
FORMULA:
*** If an object’s velocity is increasing, the direction of the acceleration is always the ________ as the direction of the velocity
*** If an object’s velocity is in a positive direction but slowing down/decreasing, then the acceleration will be _____________
The figure below shows a car and track traveling at a __________________ (shown by a horizontal line)
EXAMPLE
A jogger is out for a run. The velocity-time graph is shown. For each lettered section of the graph, describe the motion of the jogger, specifying the jogger’s velocity and direction of the movement.
A:
B:
C:
D:
E:
F:
CONSTANT ACCELERATION
Constant acceleration occurs when the velocity is changing _____________
EXAMPLE
A kingfisher diving from rest and dropping under the influence of ___________
EXAMPLE 2
What is the acceleration of the diving kingfisher whose motion is displayed on the right?
COMPARING AVERAGE SPEED and AVERAGE VELOCITY
FORMULAS
Average Speed: Average Velocity:
EXAMPLE 3
Jeremy Wotherspoon (speed skater) broke his own record by skating a time of 34.63 s during the 500 m event
(a) What was his average speed? (b) What was his average velocity?
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Truck traveling at _______________
Car traveling at __________________
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