a) Rub your palms against each other for a few minutes. How do you feel?

Question

Friction produces heat. 

a) Rub your palms against each other for a few minutes. How do you feel?

b) Strike a match stick against the rough surface of match box. What happens?

c) What is your observation in this activity?

d) What is your conclusion on this activity?

e) You have probably heard that space craft returning to the earth have to be protected by a heat shield covering it. Find out why. What is the material used as heat shield?

Answer 1

a) 

They became hot.

b) The match stick catches fire.

c) Temperature of surfaces increases due to friction.

d) Friction can also produce heat.

e) 

 

Space craft returning earth have to be protected by a heat shield covering it in order to protect it from atmospheric friction.

The material generally used is insulator of heat.