Chapter 5 Dynamics of Uniform Circular Motion
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Chapter 5
DYNAMICS OF UNIFORM CIRCULAR MOTION
PREVIEW
An object which is moving in a circular path with a constant speed is said to be in
uniform circular motion
. For an object to move in a circular path, there must be a force
exerted on the object which is directed toward the center of the circular path called the
centripetal force
. This centripetal force gives rise to
centripetal acceleration
. This
centripetal force can be provided by tension in string, friction acting between tires and the
road, or the gravitational force holding a satellite in orbit around a planet or star.
The content contained in sections 1 – 4 and 5 – 8 of chapter 5 of the textbook is included
on the AP Physics B exam.
QUICK REFERENCE
Important Terms
centripetal acceleration
the acceleration of an object moving in circular motion which is directed toward
the center of the circular path
centripetal force
the central force causing an object to move in a circular path
period
the time for one complete cycle or revolution
satellite motion
the motion of a satellite orbiting under the influence of gravity in a circular or
elliptical path around a larger mass
tangential velocity
the velocity tangent to the path of an object moving in a curved path
uniform circular motion
motion in a circular path of constant radius at a constant speed

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