Take a piece of thread. Tie a small piece of stone to one end of the thread. Hold the other end of the thread in hand and whirl it round. Note the motion of the stone. If the thread breakes suddenly, the stone files off along tangent to the circle at the instant.
Read the above passage and answer the following question:
(i) which force is whirling the stone ? who is providing this force ?
(ii) why does the stone fly off along the tangnet to the circle at that instant?
(iii) what value of life do you learn from this?