Answer the following questions in short.
Give two examples that friction produces heat.
(i). Rubbing of hands in winter to keep them warm (heats our palms because of the frictional force).
(ii). Rubbing of two rough stone surfaces to produce fire.
Answer the following question in short.
Write two methods to reduce friction.
Answer the following :
Give two examples of each to indicate that a force maybe
(a) only tend to produce motion
State two advantages of friction.
Question 2 Give two examples each of conductors and insulators of heat.