Explain the following:
Q. Explain the following:
(i) Why it is difficult to walk on marshy land?
(ii) Why does an air filled balloon rise up slightly when punctured from below?
(iii) Why does a swimmer push water backward with his hands in order to swim in forward direction ?
Ans. (i) It is difficult to walk on marshy land because when we push the ground with our feet, the ground yields and gives no reaction.
(ii) As the air comes out of the punctured balloon it applies an upward reaction on the balloon. Thereby making it rise up slowly.
(iii) According to Newton’s third law of motion, when the swimmer pushes the water backwards the water applies a forward reaction on him. This makes the swimmer move forward.
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