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  • A block of mass 1kg is at rest on a rough horizontal surface having coefficient of static friction 0.2 and kinetic friction 0.15, find the friction force (in Newtons) if horizontal force of 2.

A block of mass 1kg is at rest on a rough horizontal surface having coefficient of static friction 0.2 and kinetic friction 0.15, find the friction force (in Newtons) if horizontal force of 2.5N is applied on block - 

(g=9.8m/s2)

Option: 1

1.47


Option: 2

2.5


Option: 3

1.7


Option: 4

2.3


Answers (1)

best_answer

As we learn

Friction -

Opposing Force which is parallel to the surface and opposite to direction of Relative Motion.

- wherein

Direction of friction is always opposite the direction of Relative Motion.

 

 

fext.=2.5N

Fl = 0.2 * 1 * 9.8 = 1.96N

\because f_{ext}>F_{l}

body will be in moving condition

friction force,

F_{k} = \mu _{k}N = \mu _{k} mg = 0.15 * 1 *9.8 = 1.47N

 

Posted by

avinash.dongre

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