Question

A man pulls a sledge along a rough horizontal surface by applying a constant force $F$ at an angle $\theta$ above the horizontal. In pulling the sledge a horizontal distance $d$, the work done by the man is:

• A. $Fdcos\theta$
• B. $\frac{Fd}{cos\theta }$
• C. $Fdsin\theta$
• D. $\frac{Fd}{sin\theta }$

Answer 1

The correct option is A $Fdcos\theta$

Work done $W=force\ast displacement\ast cosQ$

$Q=\theta$

Hence $W=Fdcos\theta$