Mount Everest's height is about 8.5 kilometres. Can we have a mountain that is 20 kilometres high? When you stretch an elastic band, it increases in length, but, returns to its original size after you stop stretching it. But, if you pull it too hard, it breaks apart! What causes the elastic band to behave this way? These are the kind of questions that can be answered if we understand how solids behave when mechanical forces act on them.

In this module, we start with basic differences between solids, liquids and gases. We then discuss the three kinds of shape changes that occur in a solid when you exert a force on it. We then discuss Hooke's Law and its applications.