In patients suffering from asthma, the thickness of the airway walls increases. This thickening results in a reduction of the local shear modulus of the airways by as much as 50% compared to the airways of a healthy person. In a particular person, the local shear modulus is reduced by 21%. Assume that the frictional force due to the air flowing through the airways of this person during an asthma attack increases by a factor of 2.5 over that of a healthy person. Calculate the ratio ? of the shear strain on this person's airway to that of a healthy airway. ?=

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Mechanical Properties of Solids

There are three types of matter- solid, liquid and gas. Out of them, solids have a rigid shaped and size. The intermolecular forces of attractions in solids are greatest. Mechanical properties are the physical properties of a material which it shows, when it is provided with certain amount of force or load. These properties are to be kept in mind for various purposes. When a force is applied to an object, the object may or may not get deformed depending upon its elastic property. But every time the object develops a restoring force against the force applied. This is commonly known as stress. If the object changes its dimensions due to the force applied it develops strain ( which is the ratio of change in dimension to the original dimension).