Question
Assertion

Statement 1 : When static friction acts, there is no loss of mechanical energy.

Reason

Statement 2 : When kinetic friction acts between two bodies, there is loss of mechanical energy.

A

Both Statements 1 and 2 are true and Statement 2 is the correct explanation of Statement 1.

B

Both Statements 1 and 2 are true, but Statement 2 is not the correct explanation of Statement 1.

C

Statement 1 is true but Statement 2 is false.

D

Statement 1 is false but Statement 2 is true.

Medium

Solution

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Correct option is
B

Both Statements 1 and 2 are true, but Statement 2 is not the correct explanation of Statement 1.

Answer is B.

Because the object does not slip as it rolls, there is no loss of mechanical energy. As it rolls, the object is experiencing a combination of straight-line and rotational motion.
Kinetic (or dynamic) friction occurs when two objects are moving relative to each other and rub together (like a sled on the ground). Hence, there is loss of mechanical energy as the bodies moves rubbing each other.
Therefore, Both Statements 1 and 2 are true, but Statement 2 is not the correct explanation of Statement 1.

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