Question

Based on the Law of Energy Conservation, which of the following would best maintain a machine's ability to do work without input of additional energy?

• A. Decrease the amount of contact between component parts
• B. Increase contact between component parts
• C. use solar energy as the source
• D. use chemical energy as the source
• E. increase the number of parts in the machine

Answer 1

The correct option is A Decrease the amount of contact between component parts

If we use solar energy or chemical energy it would mean input of additional energy , which is restricted in this case.

To increase the ability to do work of machine , we have to avoid the wastage of energy in the form of heat produced , this heat is produced due to friction between component parts of machine .Friction between parts can be reduced by decreasing the amount of contact between parts .By doing that saved energy (which is not converted into heat) will be converted into work and this would best maintain the machine's ability.