Question

are there any nonconservative forces that do NOT do work on the block during the period of time when the pendulum (block and tubing) swing upward?

Answer 1

Nonconservative forces that do not do work on the block during the upward swing of a pendulum include the tension force and the gravitational force.

Step-by-step explanation:

Nonconservative forces that do not do work on the block during the upward swing of a pendulum include the tension force and the gravitational force. These forces contribute to the change in potential energy of the block without doing any work on it. In this case, the conservation of mechanical energy holds true, and there is no change in the total mechanical energy.