A compound machine is a machine composed of two or more simple machines. Common examples are bicycles, can openers and wheelbarrows. Simple machines change the magnitude or direction of a force without any motor.Know More
Simple machines are generally easy to understand and work on simple principles. They include such things as levers, which grant mechanical advantage, and wedges, which redirect relative motion, and wheels of various sorts, from pulleys to bicycle gears. These, put together, form a compound machine.
One of the simpler and older compound machines is a wheelbarrow. The classic wheelbarrow consists of two levers – its handles, which give mechanical advantage in lifting their load. They also have a wheel, which translates forward motion into rotary motion, decreasing frictional resistance compared to dragging. Another simple example is a pair of scissors. This consists of two levers with a class one fulcrum, which is a fulcrum that changes the direction of motion.
Compound machines have multiple parts that interact with each other, and at least some of them are in relative motion during use. This invariably causes internal friction, so compound machines lose efficiency when compared to simple machines. This is why many compound machines require lubrication. On the other hand, a compound machine grants the total mechanical advantage of all of its constituent parts, so it often has much greater capabilities.Learn more in Motion & Mechanics
A wedge, a lever, and a wheel and axle are types of simple machines, but a block and tackle is a complex machine because it is a combination of simple machines. A block and tackle is made from a rope or cable threaded between two or more pulleys.Full Answer >
A bulldozer is a compound machine that is made up of several individual simple machines, including levers, wheels and axles, pulleys, gears, wedges and screws. A simple machine is any component that is used to multiply and direct a force.Full Answer >
The Greek philosopher Archimedes is credited with inventing the idea of simple machines. Even though Archimedes improved on already existing ideas from unknown people, it is he who discovered the mechanical advantages of levers that people were already using to pull, push and lift items by hand.Full Answer >
Compound machines are systems that incorporate two or more simple machines into their design. A pair of scissors is a compound machine that incorporates both the lever and the wedge into its design.Full Answer >