For example, a ping-pong ball made of plastic is brittle, and a tennis ball made of rubber is elastic when acted upon by squashing forces. The extent to which an object can be perceived as rigid depends on the physical properties of the material from which it is made. It is very useful when analyzing mechanical systems-and many physical objects are indeed rigid to a great extent. Describe the types of elastic deformation of objects and materialsĪ model of a rigid body is an idealized example of an object that does not deform under the actions of external forces.Explain the concepts of stress and strain in describing elastic deformations of materials.By the end of this section, you will be able to:
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