8. FORCE AND LAWS OF MOTION
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निम्न में किसका जड़त्व अधिक है: $(a)$ एक रबर की गेंद एवं उसी आकार का पत्थर, $(b)$ एक साइकिल एवं एक रेलगाड़ी, $(c)$ पाँच रुपये का एक सिक्का एवं एक रूपये का सिक्का।

Option A
Option B
Option C
Option D

Solution

Inertia is the measure of the mass of the body. The greater is the mass of the body; the greater is its inertia and vice-versa.

$(a)$ Mass of a stone is more than the mass of a rubber ball for the same size. Hence, inertia of the stone is greater than that of a rubber ball.

$(b)$ Mass of a train is more than the mass of a bicycle. Hence, inertia of the train is greater than that of the bicycle.

$(c)$ Mass of a five rupee coin is more than that of a one-rupee coin. Hence, inertia of the five rupee coin is greater than that of the one-rupee coin.

Standard 9
Science

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