Question

Give reason
a) A raised stone possesses potential energy.
b) A falling raindrop has kinetic energy.
c) A moving cricket ball hurts more than a table tennis ball moving with the same velocity.

Answer 1

Answer:

Answer:

(a) AMOVING BALL due to motion possesses KINETIC ENERGY.

(b) A stone at rest on the top of a building possesses POTENTIAL ENERGY, ∴ Due to height above

ground.

(c) A compressed spring possesses potential energy due to changed position of spring.

(d) A moving bus possesses kinetic energy due to motion.

(e) A bullet red from a gun possesses kinetic energy due to motion.

(f) WATER FLOWING IN A RIVER possesses kinetic energy due to its motion.

(g) A STRETCHED RUBBER BAND possesses potential energy due to changed position

Answer 2

Explanation:

1. The example to show the conversion of potential energy to kinetic energy when put in use is : A stone at a height has the potential energy due to its lifted or raised position. In the figure below when the stone is dropped from that position, it begins to fall. The falling stone has the kinetic energy.
2. The source of kinetic energy of a falling rain drop is the gravitational potential energy which it gains due to height from the ground and is converted into its kinetic energy.
3. Momentum (p) = mv From the question, it is clear that velocity of both the balls is same. But mass of the cricket ball is more than that of tennis ball, and hance cricket ball has more momentum. Therefore it is easier to stop a tennis ball than a cricket ball moving with the same speed.

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