First slide

Work

Question

A person travels certain distance on a rough horizontal surface. Work done by frictional force is

Easy

A

Positive
B

Negative
C

Zero
D

Maximum

Solution

As the frictional force between feet and ground is static, there is no slipping between feet and ground so
$\begin{array}{l} S = 0 \\ \Rightarrow W = \vec{F} \cdot \vec{S} = F . SCOS θ = F \times 0 \times COS θ = 0 \end{array}$

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