Assertion and reason: energy

Exercise and reference answers

Questions

1. Reason

   Net work equals the change in kinetic energy, which is zero here.

   Verdict

   Both are true; the reason explains the assertion.

   Assertion

   A body moving at constant speed has zero net work done on it.

2. Reason

   Potential energy requires a conservative force, and friction is not one.

   Verdict

   Both are true; the reason explains the assertion.

   Assertion

   Friction has no potential energy function.

3. Reason

   Conservative forces do path-independent work.

   Verdict

   The assertion is false and the reason is true.

   Assertion

   Potential energy depends on the path taken.

Explanation