Displacement at an Angle to the Force

A body is executing SHM . If the force acting on the body is 6N when the displacement is 2cm , then the force acting on the body at a displacement of 3cm is

Can there be a displacement of any object in the absence of any external force?

If the work done is zero, then the angle between the force and displacement is

In case of negative wark, the angle between the force and displacement is

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(a) What happens to the work done when the displacement of a body is at right angles to the direction of force acting on it ? Explain your answer. (b) A force of 50 N acts on a body and moves it a distance of 4 m on a horizontal surface. Calculate the work done if the direction of force is at an angle of 60^(@) to the horizontal surface.

If there is a definite force and there is a finite displacement of the force, does that mean work is definitely done by the force ? Explain.

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