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  • Two force of magnitude F and 2F are acting on a uniform disc kept on a horizontal rough surface as shown in the fig . Friction force by the horizontal surface on the also  <img alt="

Two force of magnitude F and 2F are acting on a uniform disc kept on a horizontal rough surface as shown in the fig . Friction force by the horizontal surface on the also 

Option: 1

is in forward direction 


Option: 2

is in backward direction 


Option: 3

is zero 


Option: 4

depend on magnitude of F 


Answers (1)

best_answer

As we have learned

Direction of fiction -

If K^{2}= Rx

 

K^{2}> Rx

 

K^{2}< Rx

 

- wherein

No friction will act

 

Friction will act in backward direction

 

Friction will act in forward  direction

 

 Here 

a =\frac{3F}{M} \: \: and \: \: \alpha = \frac{F \times R}{I}

 

\Rightarrow \alpha = \frac{F \times R}{\frac{mR^2}{2}}\Rightarrow \\\\ \alpha = \frac{2F}{mR}

Since a > R \alpha   So friction will act on backward direction 

Posted by

Rishabh

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