to make life easier
All machines are constructed from six simple machines
To gain a mechanical advantage.To make things easier.
All you have to do is fine a simple task to do and find simple machines and connect them together to make it. All you have to do is fine a simple task to do and find simple machines and connect them together to make it.
because it helps you do things your too lazy to do yourself.
Simple machines are any device used to change the direction and or magnitude of a force. Levers, pulleys, wheels, and the inclined plane are all examples of simple machines.
Caste iron
oil
A bicycle consist of several simple machines, which makes it a complex machine.
Technically, no animal is a simple machine. Simple machines are the basic elements which comprise all other machines. Though some people compare animals to machines and comparisons between anatomy and simple machines might be possible, they are far from obvious.
All screws are used as simple machines.
To gain a mechanical advantage. In other words, to do something you couldn't do without it.
energy to do work