Question

select the correct answer. based on the law of conservation of energy, how can we reasonably improve a machines ability to do work? a. move the machine to a different gravitational field. b. increase the friction between its moving parts. c. reduce the friction between its moving parts. d. redefine the machines system boundaries.

Explanation:

Friction is a non - conservative force that dissipates energy as heat. Reducing friction between a machine's moving parts means less energy is wasted as heat, and more energy is available for useful work. According to the law of conservation of energy, reducing this energy - wasting factor improves the machine's work - doing ability. Moving to a different gravitational field doesn't directly improve work - doing ability related to internal machine processes. Redefining system boundaries doesn't affect the machine's inherent work - doing ability. Increasing friction would make it worse.

Answer:

C. Reduce the friction between its moving parts.