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Q.

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?


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a

2.1 kJ

b

21 kJ

c

0.21 kJ

d

21 J 

answer is A.

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Detailed Solution

2.1 kJ work is done in ploughing the length of the field.
The definition of force is the push or pull that causes an object having mass, to change its velocity.
When a force is applied to an object, movement of that object is said to have occurred. The joule (J), the SI unit of work, is defined as the amount of work required to move an object through one metre in the direction of a force of one newton.
The phrase describes the work that bullocks do:
If
Then work done = Force × Displacement
Displacement=s, and Force=F
Or W = F × s
⇒ W = 140 N × 15 m
⇒ W = 2100 J (as 1 Nm = 1 joule)
⇒ W = 2.1 kJ (as 1 kJ = 1000 J)
 
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