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18 sty 2022 · A wheel and axle is a simple machine consisting of a round disc and a long rod. The disc is known as the wheel, and the rod attached to the wheel is the axle. It executes a rotational motion and is used for many purposes.
A wheel and axle consists of a large wheel rigidly attached to a smaller axle. The resistive force is attached to the axle, and the applied effort force is attached to the larger wheel. Then the distance traveled by the resistive force is \(2 \pi r_{a}\), where \(r_{a}\) is the axle radius.
The wheel and axle is a simple machine consisting of a wheel attached to the smaller axle so that these two parts rotate with each other in which a force is transferred from one to the other.
The wheel and axle combination constitutes one of the so-called "simple machines" from which many more complex machines are derived.
The simple machine shown in Figure 9.8 is called a wheel and axle. It is actually a form of lever. The difference is that the effort arm can rotate in a complete circle around the fulcrum, which is the center of the axle.
$$\text{Wheelbarrow:} \\ \text{The wheelbarrow is a compound machine that combines a lever (the handles) and a wheel and axle (the wheel and axle). The lever provides a mechanical advantage by allowing the user to apply a smaller input force to lift a heavier load.
Some writers list the gear as a seventh simple machine, but it isn't. There are only six simple machines. The gear is a compound machine: a combination of the wheel and axle and the pulley. A system of two connected gears can provide a mechanical advantage, in a rotational sense.
