Question

Define power.
A pair of bullocks exert 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? [3 MARKS]

Answer 1

Each point: 1 Mark

1. Power is the rate of doing work.

2. Work done by the bullocks is given by the expression:
Work done = $Force\times Displacement$
$W=F\times d$

3. Where,
Applied force, F = 140 N
Displacement, d = 15 m
$W=140\times 15=2100J$
Hence, 2100 J of work is done in ploughing the length of the field.