Wheel and Axle

Iyannah and Tyrique

Machine and Purpose

Axle is attached to the center of a wheel so they both rotate simutaneously. The wheel and axle decreases the amount of mechanical energy needed to oppose gravity.

Work In and Work Out

The percentage of work input that becomes work output.

Because there is always some friction the efficiency of any machine is always less than 100 percentage.

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AMA is determined by measuring the actual forces on a machines.

IMA is the mechanical advantage in absence of friction.


There is no machine that is 100 percent efficient because energy is always lost due to heat or friction. Efficiency is measured as a ratio of the performance of the machine.
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Friction and Gravity

Machines loses energy through friction and gravity. This means the power out of the machine is less than the power in. The ratio of power out to power in is the efficiency.

Pros. of the Wheel and Axle

It is easier to push a load and you can move things or people quicker.
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Compound Machine

The wheelbarrow is designed to distribute the weight of its load between the wheel and the operator. It helps carry heavier and bulkier loads so the entire weight won't be on the operator.
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Rube Goldberg

By 1922, he was earning $100,000 a year. He won a Pulitzer Prize in 1948 for a political cartoon warning of the dangers of atomic weapons. Rube Goldberg's device performs a very simple task in a very complex and over-engineered manner. His device has been portrayed in many TV shows and Movies, past and present.
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