anonymous
  • anonymous
does friction act to make the velocity of a purely rolling body constant by balancing the other net external torque?
MIT 8.01 Physics I Classical Mechanics, Fall 1999
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schrodinger
  • schrodinger
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Vincent-Lyon.Fr
  • Vincent-Lyon.Fr
What friction are you talking about? Air friction can act this way, or spinning friction about the axis of rotation.
anonymous
  • anonymous
spinning friction tangential to contact area
Vincent-Lyon.Fr
  • Vincent-Lyon.Fr
In case of pure rolling body on a fixed base, this force is a static friction force and its power is zero. Such a force will never balance any external torque. This is why all systems with rolling bodies can be seen as conservative and solved using mechanical energy conservation.

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anonymous
  • anonymous
no i meant to say after an external torque is applied to a purely rolling body friction adjusts itself to prevent slipping of the point of contact..then after sometimes does the velocity becomes constant and friction ceases to act?
Vincent-Lyon.Fr
  • Vincent-Lyon.Fr
"no i meant to say WHILE an external torque is applied to a purely rolling body friction adjusts itself to prevent slipping of the point of contact" – Correct "..then after sometimes does the velocity becomes constant and friction ceases to act?" – If net external torque ceases to exist, velocity will be constant and, although friction is there, the friction force will be equal to zero.

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