15-2: What is efficiency?

15-2: What is efficiency?

Multiple Choice

REVIEW: If you apply a 50 N force to move something a distance of 2 m, what work did you do?

• 25 J

• 100 J

• 0.04 J

Multiple Choice

Because of friction, which will always be higher?

• Input Work

• Output Work

Multiple Choice

If you put 50 J of work into a machine and get 25 J of work out, what is your machine's efficiency?

• 50%

• 200%

• 75%

• 25%