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A constant force F has been applied upon the plank of mass M. Upon the plank, a thin circular wheel of !ass m and radius R has been placed. There is no slipping between plank and wheel. The frictional force upon wheel will be

A constant force F has been applied upon the plank of mass M. Upon the plank, a thin circular wheel of !ass m and radius R has been placed. There is no slipping between plank and wheel. The frictional force upon wheel will be

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Grade:12

1 Answers

Sreehari
13 Points
4 years ago
Imagine a basket ball 🏀on a plank.  Now as the plank is pulled by a force F, the ball moves backwards (i.e, opp to the direction of plank's move). This indicates the friction is in the backward.
 
For ball,                   For plank,
Fr=ma.                    F-Fr=Ma
Fr is the frictional force and note that both move at same accn but in opp directions.
Now divide both eqn and get 'a' rid.  Now solve for Fr.
 
We get Fr= mF/(M+m)
 
 
Frictio
 

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