This document discusses different types of machines. It describes simple machines like the inclined plane, lever, pulley, wedge, and screw. The inclined plane lifts objects by sliding or rolling. The lever applies a larger force using a smaller force. Pulleys change the direction of forces and can lift weights. Wedges cut or separate things while screws fasten things together. Compound machines are made up of simple machines working together, like cranes which use engines and pulleys to lift heavy loads, or cars which contain engines and gearboxes.

1. Types of Machines Lesson 5

2. Simple Machines The simple machines are the most basic. Like:The inclined planesThe leverPulleys Wedges and screws

3. The inclined planeIs used to lift objects by sliding or rolling them http://www.youtube.com/watch?v=pG_kT565-XQ&feature=related

4. The lever It let us apply a force at one point by making a smaller force at another point. A lever has a fulcrum, an effort point (were we make the smaller force) and a resistance point ( where the larger force is applied).http://www.youtube.com/watch?v=wV1pYkTtsxg&feature=related

5. The pulleyLifts weightsThey change the direction in which forces act. For example, when we pull down on the end of a rope on a pulley, the load attached to the end of the rope rises.http://www.youtube.com/watch?v=TlPWy7qW7oM&feature=related

6. A Wedge A screw A wedge cuts or separates things.We use the screws to fasten things together.

7. Compound Machines Compound machines are combinations of simple machines Cranes have an engine. They have one or more pulleys. We use cranes to lift very heavy objects, like metal beams Cars are made up of a lot of simple machines. For example, cars have an engine, a gearbox, etc.