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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