An inclined plane is an example of a

• Simple machine

• Complex machine

Selec the image where we can see a pulley

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• 
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Which of the following machines are complex? (there can be more than one)

• Screw

• Freezer (thermal machine)

• Wheel

• Computer (Information procesing machine)

An example of a simple machine is a ...

• Mobile phone

• Wedge

• Car

• Plane

Write the name of this simple machine:

A machine with few o no moving parts is a simple machine.

• True

• False

A lever consist of... (select the three parts)

• Fulcrum

• Wheel

• Effort

• Load

• Screw

Thermal machines apply force to another object to make it move.

• True

• False

You can use a screw...

• to tighten or join objects together.

• to move objects from onle level to another.

• to cut or to hold objects in place.

The round shape of the wheel reduces the amount of friction.

• True

• False