Question

Give examples of forces which change the shape of the objects.

Answer 1

Hint: The change in the shape of the body is the measure of the strength of the body which can be defined as the measure of strain produced on applying stress at any part of the body. The bodies which change the shape to much extent on applying some force can be said to be made from low-density material whereas that which retains its shape the most after applying some force can be said to be made from highly dense material.

Complete step-by-step solution:
In the practical world, every object changes its shape on the application of force. Even metals or steel bars change its shape on the application of forces. The difference is the extent of deformation of shape on the application of forces. For example in solids, change in shape is so less that it becomes difficult to observe it, hence we call it negligible change. Whereas in the case of fluids (Fluids means both gases and liquids), even the smallest possible force can alter the shape of the body continuously, until the force is removed. Some examples of such forces are:
* The force of compression which tends to decrease the length of a rod.
* The force of expansion which tends to elongate springs, rubber bands.
* The shear force which tends to turn a cube made of rubber to a parallelogram, as shown in the figure.

* The force that acts between cars on colliding.
* The force which acts when we try to compress a balloon, and lots more.

Note: All these forces have their own properties when applied onto a certain material in a certain direction. The deformation not only depends on the amount of force applied but also on the direction of application and the material on which force is applied.