College Physics

11th Edition
Raymond A. Serway + 1 other
ISBN: 9781305952300



College Physics

11th Edition
Raymond A. Serway + 1 other
ISBN: 9781305952300
Textbook Problem

In a popular amusement park ride, a rotating cylinder of radius 3.00 m is set in rotation at an angular speed of 5.00 rad/s, as in Figure P7.73. The floor then drops away, leasing the riders suspended against the wall in a vertical position. What minimum coefficient of friction between a rider’s clothing and the wall is needed to keep the rider from slipping? Hint: Recall that the magnitude of the maximum force of static friction is equal to μsn, where n is the normal force—in this case, the force causing the centripetal acceleration.


Figure P7.73

To determine
The minimum co-efficient of friction.


Given info: Radius of the cylinder (r) is 3.00 m. The angular speed of rotation ( ω ) is 5.00 rad/s.


The normal force provides the centripetal acceleration. Therefore,


  • m is the mass of the person.

The maximum static force of friction equals the weight of the person. Hence,


  • fs is the force of friction.
  • g is the acceleration due to gravity.

The force of friction is,


From the above equations,


On Re-arrang

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