Question

A block of man 3 kg is placed on the floor of coefficient of static friction is 0.4. The force 3.5 N applied on the block. Calculate the force of friction and discuss the motion & the body.

• A. 12.76N
• B. 11.76N
• C. 3.5N
• D. None of the above

Answer 1

The correct option is C 3.5N

f is frictional force

$f_{max}={\mu }_s\left(mg\right)=0.4(3\times 10)=12N$

If $F=3.5N$ , then frictional force is;

$f=F=3.5N$

block doesn't move by force $F\le 12N$