When do we say that work is done?
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?
A force of 7 N acts on an object. The displacement is, say 8 m, in the direction of the force (see the given figure). Let us take it that the force acts on the object through the displacement. What is the work done in this case?
Write an expression for the work done when a force is acting on an object in the direction of its displacement.
Soni says that the acceleration in an object could be zero even when several forces are acting on it. Do you agree with her? Why?
- Science Textbook for Class 9