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PHY 201
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A steel ball of mass 110 grams moves with a
speed of 30 cm / second around a circle of
radius 20 cm.
What are the magnitude and direction of the
centripetal acceleration of the ball?
answer/question/discussion: ->->->->->->->->->->->-> :
a=v^2/r
a=(.3m/s)^2 / .2m
a=.45m/s^2
Is the acceleration directed away from the
center of the circle?
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The ball is constantly turning toward the center of the circle. So its acceleration is toward the center. 'Centripetal' means 'toward the center'.
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What is the magnitude and direction of the
centripetal force required to keep it moving
around this circle?
answer/question/discussion: ->->->->->->->->->->->-> :
F=m*a
F=.11kg*.45m/s^2
F=.05N
Directed toward the center of the circle?
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Right.
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*#&!
&#Good responses. See my notes and let me know if you have questions. &#