Machines reduce the amount of work needed to do a job.
True
False
The amount of work cannot be reduced by using machines.
Machines are used for reducing efforts and doing more work in less time.
What should we do to reduce the amount of effort needed to lift something using a lever?
Three spraying machines working together can finish painting a house in 60 minutes. How long will it take 5 machines of the same capacity to do the sane job ?