# What are two compound machines?

A compound machine is made up of at least two basic machines. Compound machinery include bicycles, automobiles, scissors, and fishing rods with reels. Compound machines are less efficient but have a bigger mechanical advantage than simple machines. For example, a bicycle's pedal mechanism uses a combination of pedals and a crank to provide a mechanical advantage of two to one. This is because only one pedal is needed to propel the bicycle using this method.

In engineering, a mechanical advantage is the ratio between input and output forces in an apparatus that uses levers or other components to multiply these forces. For example, a four-wheel vehicle has a mechanical advantage of 4:1 due to the effort required to drive all four wheels vs. the amount of force needed to push down on the driver's side pedal.

Simple machines consist of one moving part which acts upon another single part. Examples include a lever, a pulley, and a wheel. These machines can be used to increase or decrease the size of a force by utilizing its own weight. For example, if you need more torque (turning force) than what a screwdriver provides, then a sledgehammer will fit your needs. Or, if you need to lift something heavy, then a crane is necessary. Simple machines are easy to construct and often serve as educational tools for students to learn about mechanics.

## Is a sewing machine a simple machine or a compound machine?

A compound machine is a device made up of many basic machines. Sewing machines, fishing rods and reels, and cranes are all examples of compound machines since they contain many machinery. Sewing machines, fishing rods and reels, and cranes are examples of compound machinery.

Simple machines are devices that include one driving mechanism for each part of the machine. Motor-driven rotary tools such as drills and lathes are examples of simple machines. The sewing machine is an example of a complex machine because it contains multiple parts that function together to produce a finished product.

In general, simple machines can be understood as those that have few moving parts while compound machines have many moving parts. However, this is not always the case; some complex machines have many moving parts while other simple machines have few moving parts. For example, a rocker box used on a rocking horse has many moving parts but only operates its function once per revolution of the wheel it is mounted on; thus, it is a simple machine. A drill bit used in drilling holes works exactly like a simple machine motor since it has only one part that functions at a time so it is also considered simple.

Some inventions are based on simple machine designs while others are based on compound machine designs.

## Is a wheelbarrow a compound machine?

A compound machine is one that is made up of more than one basic machine. Compound machines, like a wheelbarrow or corkscrew, are made up of only two basic machines. Large compound machines, such as automobiles, are made up of hundreds or thousands of basic machines. Compound machines are easy to understand if you think about it: any combination of levers and wheels can be used to raise or lower something using the principle of counterbalance. For example, a person could use two opposite-side wheels and a pair of levers to lift an object that weighs more than either single wheel.

In this lesson, you will learn how to calculate the power required by a wheelbarrow. First, you will need to determine the maximum weight that can be lifted in a given area with what is available. You do this by dividing the total weight by the lifting area, which gives you the maximum load capacity in pounds. From there, you can calculate the power required by multiplying the vehicle's torque value by its speed. Finally, you can compare your result to the table below to see if it is within 15% of the required power.

You should note that the power requirement is higher than most people would expect. This is because the wheelbarrow is not being used in its optimum condition. To estimate the real power needed, multiply the results from our calculation here by 1.5. This will allow for some loss due to friction.

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