Question

efficiency - the ratio of work input to work output. it is represented as a percentage (%). the higher the percentage (%) is the higher the efficiency of the machine. work input is the amount of work you put into a machine. work output is the amount of work done by the machine. friction is the opposing force one object exerts on another when they touch. choose the correct answer which machine is the most efficient? a lawnmower with 85% efficiency scissors with 60% efficiency nail clippers with 55% efficiency

Explanation:

Step1: Recall efficiency rule

Efficiency is a percentage; higher % means more efficient.

Step2: Compare the efficiencies

Lawnmower: 85%, Scissors: 60%, Nail clippers: 55%.
85% > 60% > 55%.

Answer:

A lawnmower with 85% efficiency