Basic Machines Types Simple machines are designed to make work easier using few parts. A doorknob is a simple machine that only has two main parts. Six basic types of simple machines exist: the lever, inclined plane, wedge, pulley, screw and the wheel and axle. read more
The mechanical advantage of 2 mechanism which is rack and pinion and wheel and axle makes up to become a door knob. Here, the wheel represents the knob which is connect to another smaller disc who acts as load and the axle is the rod which connects these 2 discs. read more
A doorknob is considered a wheel and axle because it has a wheel portion, the knob, and an axle, the rod in the door, that turn on the same axis. In instances such as a doorknob, a wheel and axle can also be considered a type of lever. read more
A wheel and axle is made by putting a shaft through the center of a larger wheel. Twisting the axle by itself is difficult, but attaching a wheel makes the job easier. In the case of a doorknob, the knob is the wheel and the central shaft through the door is the axle. read more