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1. Derive that efficiency is the ratio.

2. How can we say that a wheelbarrow is a compound machine?

3. Describe briefly how a screw and a wedge are modifications of the inclined plane.

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Final answer:

Efficiency is the ratio of output work to input work in a machine. Wheelbarrows are compound machines with multiple simple machines. Screws and wedges are modified versions of the inclined plane.


Explanation:

Efficiency in a machine is the ratio of output work to input work, representing how well a machine converts input work into useful output work. For example, if a machine has an efficiency of 80%, it means 80% of the input work is converted into useful output work.

A wheelbarrow is a compound machine because it consists of multiple simple machines working together. It typically involves a wheel and axle as well as an inclined plane to help with lifting and moving heavy loads.

The screw and wedge are both modifications of the inclined plane. A screw is a spiral inclined plane wrapped around a cylinder, while a wedge is formed by two back-to-back inclined planes that meet to form a sharp edge, such as in knives or axe heads.


Learn more about Simple machines here:

https://brainly.com/question/19336520


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