Question

( 20 points ) Jerri is planning to rebuild the engine of an antique car. She has chosen all the materials she needs including a high quality synthetic oil to reduce friction in the engine. What effect will reducing friction have on the engines performance?

A Reduces friction means reduced efficiency

B Reduces friction means reduced heat transfer

C Reduces friction means increased efficiency

D Reduces friction means increased heat transfer

Answer 1

The option, B. Reduced friction means reduced heat transfer " is correct.

Answer 2

Answer:

Reduces friction means increased efficiency

Explanation:

Friction is known to decrease efficiency in machines. In redesigning the engine if the antique car, and the inclusion of oil to reduce friction in the engine, she aims to improve the efficiency of the engine.

Friction leads to lost work in mechanical systems. Friction accounts for the fact that the efficiency of an engine is never 100% since some of the input work is lost as friction.

Hence decreasing the friction improves the efficiency of the machine.