A block of mass 1 kg is pulled along the curve path A C B by a tangential force as shown in figure. The work done by the frictional force when the block moves from A to B is

Question

A block of mass 1 kg is pulled along the curve path A C B by a tangential force as shown in figure. The work done by the frictional force when the block moves from A to B is (A) 5 J (B) 10 J (C) 20 J (D) None of these

Tardigrade Admin · Accepted Answer

Work done by friction =∫ vecF ⋅ d s=∫ limits0x μ m g cos θ (d x/ cos θ)=μ m g x=20 J

Q. A block of mass $1 k g$ is pulled along the curve path $A CB$ by a tangential force as shown in figure. The work done by the frictional force when the block moves from $A$ to $B$ is

$5 J$

$10 J$

$20 J$

None of these

Work done by friction
$= \int F \cdot d s = 0 \int x μ m g cos θ \frac{d x}{c o s θ} = μ m gx = 20 J$

Q. A block of mass 1kg is pulled along the curve path ACB by a tangential force as shown in figure. The work done by the frictional force when the block moves from A to B is

5J

10J

20J