Question

1. Explain why a machine or a mechanism

cannot have an efficiency of 100 % .

2. If the efficiency of a machine increases,

what happens to each of the following?

(Use the w rds " increases," "decrease ,"

or "stays the same" to describe the

changes.)

(a) input work

(b) useful output work

(c) friction

(d) mechanical advantage

3. What is the mathematical relationship

bet Aleen efficiency, input v·,rork, and

useful output work?

4 . Explain how a lubricant affects th

efficiency and the frictional forces of a

machine.

Answer 1

Answer:

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