A tire stops a car by use of friction.What modulus should we use to calculate the stress and strain on the tire?
A)Young's modulus
B)compression modulus
C)shear modulus
D)bulk modulus

Question

Quizplus · Accepted Answer

Young's modulus is used to calculate stress and strain in the axial direction of a material, compression modulus is used for the material's response to compression, and bulk modulus is used to measure the material's response to changes in volume under pressure. None of these is directly applicable to the stress and strain experienced by a tire during braking, which involves forces acting in multiple directions.

The shear modulus, however, is a measure of a material's resistance to deformation by shear stress, which is precisely the kind of stress the tire experiences as it grips the road and slows down the car. Therefore, the shear modulus is the best choice for calculating stress and strain on the tire during this process.

A Tire Stops a Car by Use of Friction