When installing a Red Carpet for the Oscars, workers found that if they push the carpet roll (image included) in the direction to unroll, it will keep unrolling by itself. However, if they push it to roll it up, it will move some distance and then stop. Why is this happening if the surface is flat and the friction is negligible? Calculate the distance the roll will move if it is initially given a push of velocity v0 =1 m/s to roll it up. The carpet is 1 in thick, 60 m long and half-rolled up prior to being pushed. (Hint: use energy conservation.)

When installing a Red Carpet for the Oscars, workers found that if they push the carpet roll (image included) in the direction to unroll, it will keep unrolling by itself. However, if they push it to roll it up, it will move some distance and then stop. Why is this happening if the surface is flat and the friction is negligible? Calculate the distance the roll will move if it is initially given a push of velocity v0 =1 m/s to roll it up. The carpet is 1 in thick, 60 m long and half-rolled up prior to being pushed. (Hint: use energy conservation.)

Glencoe Physics: Principles and Problems, Student Edition

1st Edition

ISBN:9780078807213

Author:Paul W. Zitzewitz

Publisher:Paul W. Zitzewitz

Chapter5: Displacement And Force In Two Dimensions

Section: Chapter Questions

Problem 8STP

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