0
$\begingroup$

The left side of the spring is attached to the wall, and there is a block attached to the right side of the spring. If the spring is compressed to the left, why does the wall do zero work on the spring + block system?

$\endgroup$

1 Answer 1

0
$\begingroup$

Work is done when a force is applied and the point of contact moves. In your example, the point of contact between the spring and the wall does not move - rather the entire spring expands and it is therefore the spring which does work.

A similar situation occurs when you climb the stairs. The stairs do not do work on you. Your body does the work by pushing the muscles and bones into a new position while applying force on them.

$\endgroup$

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.