Write an expression for the work done when a force is acting on an object in the direction of its displacement.
In each of the following a force, F is acting on an object of mass, m. The direction of displacement is from west to east shown by the longer arrow. Observe the diagrams carefully and state whether the work done by the force is negative, positive or zero.
An object thrown at a certain angle to the ground moves in a curved path and falls back to the ground. The initial and the final points of the path of the object lie on the same horizontal line. What is the work done by the force of gravity on the object?
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