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Chapter 9: Q18Q (page 230)

Examine how a pair of scissors or shears cuts through a piece of cardboard. Is the name 鈥渟hears鈥� justified? Explain.

Short Answer

Expert verified

The pair of scissors produces shear stress in the cardboard for cutting it.

Step by step solution

01

Understanding shear stress

When a body is under shear stress, it has equivalent and opposite forces exerted across its opposite faces.

02

Evaluating the process by which a pair of scissors cuts through a piece of cardboard

Yes, the name shears instead of scissors is justified. When a pair of scissors is used to cut through a piece of cardboard, one scissor blade pushes down on the cardboard, while the other pushes down with an equal amount of force but in the opposite direction.

This generates shear stress in the cardboard that causes it to fail.

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