Bicycle is an example of a Compound machine.

Definition of a Compound machine:
A compound machine is a device that consists of two or more simple machines working together to perform a specific task. Simple machines are basic mechanical devices that make work easier by changing the direction or magnitude of a force applied. Some examples of simple machines include levers, pulleys, wedges, screws, inclined planes, and wheels and axles.

Explanation:

1. Wheels and Axles:
A bicycle consists of wheels and axles, which are one of the six types of simple machines. The wheels and axles of a bicycle allow for easy movement and transportation by reducing friction between the bicycle and the ground. The wheels also act as a mechanical advantage, making it easier to move the bicycle forward.

2. Levers:
A bicycle also includes several levers, which are another type of simple machine. The pedals and cranks of a bicycle act as levers, allowing the rider to apply force and generate rotational motion. The handlebars of a bicycle are also levers that enable the rider to steer and control the direction of the bicycle.

3. Pulleys:
Although not as prominent as wheels and levers, a bicycle also utilizes pulleys. The chain and gears of a bicycle form a pulley system that transfers the rotational motion from the pedals to the wheels. This pulley system allows the rider to change gears and adjust the force applied to the wheels.

Conclusion:
Based on the above explanation, a bicycle is considered a compound machine because it incorporates multiple simple machines, including wheels and axles, levers, and pulleys, all working together to allow for efficient movement and control.

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