Write an expression for the work done when a force is acting on an object in the direction of its displacement.

Write an expression for the work done when a force is acting on an object in the direction of its displacment.

Write an expression for the centripetal force.

Write an expression for the kinetic energy of an object.

when is the work done by a force negative.

What happens when force acting on an object are in opposite direction and equal?

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.