# Shared Flashcard Set

## Details

Chapter 5
Dynamics of Uniform Circular Motion
10
Physics
01/26/2015

Term
 uniform circular motion
Definition
 the motion of an object traveling at a constant (uniform) speed on a circular path
Term
 period T
Definition
 the time required to travel once around the circle; the time required to make one complete revolution
Term
 Does the definition of uniform circular motion state that the direction of the velocity vector stays constant?
Definition
 no!
Term
 The acceleration in uniform circular motion is called _____ because it points toward the center of the circle
Definition
 centripetal acceleration
Term
 Since the word _____ means "moving toward a center", the acceleration in uniform circular motion is called centripetal acceleration
Definition
 "centripetal"
Term
 What is the direction of centripetal acceleration?
Definition
 the centripetal acceleration vector always points toward the center of the circle & continually changes direction as the object moves
Term
 centripetal force (vector Fc)
Definition
 the net force causing the centripetal acceleration; points in the same direction as the acceleration (toward the center of the circle)
Term
 Is the centripetal force always one force?
Definition
 no! (it can be the net sum of many forces)
Term
 For a given orbit, does mass matter for orbital speed of a satellite?
Definition
 no!
Term
 Kepler's law
Definition
 the fact that the period is proportional to the three-halves power of the orbital radius
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