Why doesen't perpendicular force contribute to the work done by a body? and why is no work done when a body is lifted against gravity?

Open in App

Solution

Work done is the dot product of force and displacement
W=F.d=FdcosÎ¸
Î¸ is the angle between force applied and the displacement
in your question Î¸ is 90°
cos90°=0
so work done =0

Suggest Corrections

Similar questions

Q. Why is the work done zero when the force acting on a body is perpendicular to its displacement?

Q. When a body is lifted up, the work done by the applied force is negative.

(a) When do we say that work is done? Write the formula for the work done by a body in moving up against gravity. Give the meaning of each symbol which occurs in it.

(b) How much work is done when a force of 2 N moves a body through a distance of 10 cm in the direction of force?

Q. What is the work done against gravity when a body is moved horizontally along a frictionless surface?

Q. When a body moves in a circular path, no work is done by the force since :

Join BYJU'S Learning Program

Why doesen't perpendicular force contribute to the work done by a body? and why is no work done when a body is lifted against gravity?

Work done is the dot product of force and displacementW=F.d=FdcosÎ¸Î¸ is the angle between force applied and the displacementin your question Î¸ is 90° cos90°=0so work done =0

Work done is the dot product of force and displacement
W=F.d=FdcosÎ¸
Î¸ is the angle between force applied and the displacement
in your question Î¸ is 90°
cos90°=0
so work done =0