How many tyoes of simple machines exist?

Answer 1

There are six types of simple machines: the lever, the inclined plane, the wheel and axle, the pulley, the screw, and the wedge. Each of these machines uses a mechanical advantage to make work easier by either changing the direction of a force or allowing for a smaller input force to accomplish a task. Simple machines are fundamental components of more complex machines and have been used throughout history to enhance human productivity.