Week 22 - Mechanical Advantage, Speed Ratio and Gears
1 Simple Machines
Read pages 258 - 260 and 315 - 320
|We are all familiar with the use of machines in our daily life to make our work easier. Some of these machines are very simple in nature, but some of them are made of many parts. We will begin our study with the examination of the types of simple machines that we commonly use. Combinations of these simple machines working together in a system make more complex machines - the topic of the next lesson|
In your study of the lever, you will have discovered that there are three types of levers - first class, second class and third class. The following video segment will help you to understand better how levers work. Pay particular attention to the position of the fulcrum, the load force and the effort force in each of the three classes of lever.
View this website on types of levers:
Conclusions: The inclined plane, the wedge and the screw all related to each other. Generally, the inclined plane allows you to lift heavy objects using a smaller force. The down side is that you must do it over a greater distance.
The wedge is really two inclined planes together and it's main function is to split an object apart.
The screw can be thought of as an inclined plane wrapped around a cylindrical core. It functions by a rotational motion.
See what happens when a second pulley is added to the system.
This site allows you to work with simple pulleys and pulley systems to alter the masses in the system to see what happens. Try it out!