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In the explanation of the theory of friction, the block used to have an assumption. That is the upper portion of the block is considered to be rigid.

(a) True

(b) False

I have been asked this question in examination.

I want to ask this question from Characteristics of Dry Friction topic in division Friction of Engineering Mechanics

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The correct answer is (b) False

To elaborate: 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.

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