A boy has four options to move a body through 3m as indicated In which case is maximum number one nb...........

General Science (Easy) Physics

A boy has four options to move a body through 3m as indicated. In which case is maximum number one work done?

Push over an inclined plane

Lift vertically upwards

Push over smooth rollers

Push on a plane horizontal surface

Lift vertically upwards

-Work done will be maximum when the force is applied against the gravitational as it opposes the force.

Mathematically work done = F.x Cosθ where θ is the displacement angle

When the body is lifted vertically upwards the displacement angle is 180 degrees and Cos180 is -1.

Hence work done will be maximum when the displacement angle will be 180 degrees i.e vertically upwards.

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