How do machines get work done efficiently?

So, a machine is a device that changes a force, and these machines actually make people's work easier although it does costs a lot of money for repairs, along with how many you have to buy. But continuing on with the question, Machines changes a way in which work is done; for example let's talk about people who hire movers to help them move to new home, they have machines that help them get things done faster like the vehicles, ramps, etc... Machines make the process go by faster and not have to carry the exact amount of weight which becomes easier for us.