Centripetal and Centrifugal Forces
المؤلف:
GEORGE A. HOADLEY
المصدر:
ESSENTIALS OF PHYSICS
الجزء والصفحة:
P-63
2025-11-02
38
The pull of the string that compels the body in Fig. 1 to move in a circular path is directed toward the center, C, and is called the centripetal force. Since this force acts constantly in a direction at a right angle to the direction of the motion of the body, it does not affect its velocity, but does give it an acceleration towards the center. The reaction that the moving body offers to the centripetal pull of the cord is called the centrifugal force and is equal, in amount, to the centripetal force. If part of the cord is replaced by a spring scale, its reading will be a measure of this force, which depends upon the mass of the body, its velocity, and the radius of the circle. The acceleration given by centripetal force is equal to 
the expression for either centripetal or centrifugal force is Since force equals Ma or
Fig. 1
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