If the displacement is done by the force then when does the force is consider as constant ?

When is the work done by a force is positive and negative ?

When is the work done by a force zero?

A body of mass 2 kg is rest on a smooth horizontal surface . When a horizontal force of 0.5 N acts on this bofy it is displaced in the direction of the force . Find the work done by the force in 8.0 s .Show that this work is equal to the change in kinetic energy of the body .

The relation between position and time f for a particle , performing one dimensional motion is as under : t = sqrt(x) +3 Here x is in metre and t is in second . (1) Find the displacement of the particle when its velocity becomes zero . (2) If a constant force acts on the particle , find the work done in first 6 second .

A force of 7 N acts on an object. The displacement is, say 8 m, in the direction of the force. Let us take it that the force acts on the object through the displacement. What is the work done in this case?

The displacement x of particle moving in one dimension, under the action of a constant force is related to the time t by the equation t = sqrt(x) +3 where x is in meters and t in seconds . Find (i) The displacement of the particle when its velocity is zero , and (ii) The work done by the force in the first 6 seconds .

A spring of force constant k is cut into two pieces such that one piece is double the length of the other. Then the long piece will have a force constant of:

Explain work done by a constant force .