Force on a Rod between rigid walls: If a rod is supported between two rigid walls of exactly same size as that of separation between the walls, a normal force is developed between the ends of the rod and the walls, if temperature of system increases. Due to rise in temperature, the rod expands and it pushes the walls outside, and experiences the same force inward by the walls. This inward force compresses the rod elastically as walls are rigid. The normal force can be calculated by using Young’s modulus of the rod. Watch the video below for complete analysis of this situation.

https://youtu.be/viQ_E2kcEtU

Effect of Temperature on Pendulum Clocks:

The time period of a pendulum depends on its length. As the temperature increases in summers, the time period of the pendulum clocks also increase, and due to this, clocks slow down and start loosing time. Similarly, in winters, due to low temperature, pendulum clocks gain time and become faster. Watch the analysis video below to understand the concept.

https://youtu.be/0RcpqFSGtII

To understand the applications of the concept, see the example videos given below –

Example Video – https://youtu.be/12quucp4kbY

Example Video – https://youtu.be/1dOcqEkU1HY