Question

A pair of bullocks exerts a force of 140 N on a plough. The field being ploughed is 15 m long. How much work is done in ploughing the length of the field?

Answer 1

Step (1):

Given:

Applied force, $F=140N$

Displacement, $d=15m$

Step (2):

Statement and expression for Work (W):

Work is said to be done when a force applied to an object moves that object.

The expression for work done by the bullocks is,

$Workdone=Force\times Displacement$

Step (3):

Substituting the given values in the expression for Work done (W):

$$\begin{gathered} W=F\times d \\ W=140\times 15 \\ W=2100J \end{gathered}$$

Hence, 2100 J of work is done in ploughing the length of the field.