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?


  • In Physics, force is defined as the push or pull on an object with mass that causes it to change its velocity.
  •  Work is said to be done when a force applied to an object moves that object.
  • The SI unit of work is the joule (J), which is defined as the work done by a force of 1 Newton in moving an object through a distance of 1 meter in the direction of the force.

The expression gives work done by the bullocks:

Work done = Force – Displacement

W= F – d


  • Applied force, F = 140 N
  • Displacement, d = 15 m

W= 140 — 15 = 2100 J

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

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