Simple and Complex Machines

Which of these is an example of a simple machine?

• staple

• nail

• screw

• glue

A machine is used for a purpose to:

• make work harder

• prevent work being done

• make work easier

• make work more complicated

A complex machine is:

• the same as a single simple machine

• two simple machine only

• two or more simple machines

• four simple machine

Which of these is an example of a complex

• lever

• pulley

• wedge

• car jack

Which of these is not a part of a lever?

• load

• hinge

• fulcrum

• effort

Use the equipment listed below to design an investigation to show how using an inclined plane can help you raise a heavy book more easily.

heavy book, wooden board, pile of books, Force Meter (spring balance), string

Remember to include your: Aim, Hypothesis, Prediction, Materials/Equipment, Observation/Findings, and Conclusion

a. Draw a copy of the diagram of a common lever found in playgrounds and label the different parts of the lever.

b. A parent wants to use the seesaw with their small child. A scientist suggests that if the parent sits near the middle of the seesaw on their end and the child sits near the far end of the seesaw on their side, the seesaw will balance.

Test this idea by designing and carryout out an investigation using a ruler, pencil, and coins to represent the persons.

c. What conclusion can you make about the investigation?

a. Identify three different simple machines in the diagram.

b. Explain why the human body can be defined as a complex machine.

c. Describe one other complex machine.