A ball swung on a string held by a sleeve.

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(A)Mechanics - A+0: Acceleration

Fictitious Forces: Centrifugal and centripetal acceleration. A qualitative demonstration of the relationship of m, v , and r. The sleeve is held in the hand, and the ball is swung in a circular motion. Pulling on the ring shortens the radius of the balls path and increases the velocity.
UCB Index: 
A+0+35
PIRA Index: 
1D50.10
Demo Diagram: 

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PIRA Taxonomy:

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A+0+31 Swinging mass M lifts mass 2M
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A+0+40 Conical pendulum: Similar to A+0+35 with standard weights.