Question

In the explanation of the theory of friction over which conservative forces were acted upon, the block used to have an assumption. That is the upper portion of the block is considered to be rigid.

(a) True

(b) False

The question was posed to me during a job interview.

Origin of the question is Conservative Forces in chapter Principle of Virtual Work of Engineering Mechanics

Answer 1

Right choice is (b) False

For explanation: The block used to explain the theory of friction is placed on a deformable surface. As we know that the theory of friction says that when there is no lubricating fluid present between the surfaces in contact, the dry friction occurs. Thus to show the same, experiments are done over a non-rigid/deformable surface which is having a rigid shape.