A tensile test is conducted on polypropylene at different load rates (1 mm/min, 10 mm/min, 100 mm/min) and the Young's modulus is determined from the slope and intercept of the obtained curves. Which sentence is correct? The Young modulus increases when the load rate increases The Young modulus can increase or decrease with load rate The Young modulus is the same in the three cases The Young modulus decreases when the load rate increases None of the above sentences is correct

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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).