Gr. 8- Mechanical Systems UNIT REVIEW

What is a machine designed to do?

How did ancient machines pave the way for improvements?

What is a simple machine?

In the chart below, describe the different types of simple machines and give examples of each type.

Illustrate and give examples of the three classes of levers.

Simple machines can be used to obtain "4" different effects! Briefly describe each effect.

In the diagram, identify the different machines that make a bicycle.

What are the functions of linkages?

What are the functions of transmissions?

What are gears used for in mechanical devices?

In the following chart, illustrate the following types of gear trains and briefly explain what they would be used for.

What is mechanical advantage?

In the box provided write the formula on how you calculate mechanical advantage?

What is speed ratio?

In the box provided write the formula on how you calculate speed ratio?

What effect does friction have on a machine?

How is the efficiency of a machine calculated?

What is the scientific definition of work?

How is work calculated?

What is a hydraulic system?

What does Pascal’s Law state in relation to fluids in an enclosed system?

How is mechanical advantage determined in hydraulic systems?

What criteria are usually used to evaluate a mechanical device?

Describe the evolution of the pop can opener which lead to improvements in design.

Technology develops through change!

Technology development is influenced by scientific knowledge, trial and error and changes in society and the environment.

Describe how each of the following results in new technologies being developed.