Physics 105, Fall Term, 2009
Reading: Chapters 7.4
Did you complete the reading assignment?
acceleration is the linear acceleration experienced by a rotating object.
2) Centripetal force is the force that
keeps an object in rotational motion.
Go back to:
http://phet.colorado.edu/sims/rotation/rotation_en.jnlp and click on the
'Rotational' tab at the very top of the applet.
Change the graph settings to show centripetal acceleration by clicking the 'θ,
ω, a' bubble. Start with the ladybug close to the center of the rotating
platform and change the angular velocity to 90 degrees per second and press
'Go'. While the platform is spinning move the lady bug out toward the edge of
How does this affect centripetal acceleration?
Increases centripetal acceleration
Decreases centripetal acceleration
Centripetal acceleration remains the same
What is the direction of the centripetal acceleration vector?
The direction of centripetal acceleration is always linearly inward, toward the center of the circle.
Since the ladybug has a mass, there is a force associated with this acceleration
called the centripetal force. What is the direction of the centripetal force?
The direction of centripetal force is the same as the direction of the centripetal acceleration. It is always linearly inward, toward the center of the circle.
If the beetle was swapped for the lady bug (it has a greater mass), how would
the centripetal force be affected?
Increases centripetal force
Decreases centripetal force
Centripetal force remains the same
When experiencing a constant angular velocity, like on a spinning ride at a
theme park, you are pushed out from the center of the circle. What causes this
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Was there anything that you didn't understand in the reading assignment?
What was confusing to you?