The maximum compressional stress that a bone can withstand is 1.6 × 108 N/m2 before it breaks. A thighbone (femur), which is the largest and longest bone in the human body, has a cross sectional area of 7.7 × 10−4 m2. What is the maximum compressional force that can be applied to the thighbone? (a) 2.1 × 1011 N, (b) 1.2 × 105 N, (c) 4.8 × 1012 N, (d) 3.0 × 103 N, (e) This cannot be determined since Young’s modulus is not given.

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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).