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Question

Rewrite the following sentences using proper alternative.

a. The potential energy of your body is least when you are .....
(i) sitting on a chair
​(ii) sitting on the ground
​(iii) sleeping on the ground
(iv) standing on the ground

b. The total energy of an object falling freely towards the ground ...
(i) decreases
(ii) remains unchanged
(iii) increases
(iv) increases in the beginning and then decreases

c. If we increase the velocity of a car moving on a flat surface to four times its original speed, its potential energy ....
(i) will be twice its original energy
(ii) will not change
​(iii) will be 4 times its original energy
(iv) will be 16 times its original energy.

d. The work done on an object does not depend on ....
(i) displacement
(ii) applied force
(iii) initial velocity of the object
(iv) the angle between force and displacement.

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Solution

a. The potential energy of your body is least when you are sleeping on the ground.

b. The total energy of an object falling freely towards the ground remains unchanged.

c. If we increase the velocity of a car moving on a flat surface to four times its original speed, its potential energy will not change.

d. The work done on an object does not depend on initial velocity of the object.

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