1. Mechanical Advantage Pg. 280 Teacher: Ms. Barnard

2. Simple machines in the body The body is made up of multiple levers There is no wheel and axle in the body http://www.dynamicscience.com.au/teste r/solutions/hydraulicus/humanbody.htmhttp://www.dynamicscience.com.au/teste r/solutions/hydraulicus/humanbody.htm http://www.peworld.org/student_resour ces/powerpoint/levers/sld012.htmhttp://www.peworld.org/student_resour ces/powerpoint/levers/sld012.htm

3. Review transmission What is transmission? ▫Large force to move objects slowly OR a smaller force to move objects quickly Transmission Lego ▫In first gear, what was the size of the driving gear? ▫What about in third gear?

4. A machine can make work easier by increasing the force exerted Mechanical Advantage (MA) = Output force Input force MA can also be called the force ratio

5. Output force = the force the machine applies on the object Input force = the outside force that is applied to the machine

6. MA clip http://www.neok12.com/php/watch.php?v=zX5 d6f5f6f6807494046007b&t=Simple-Machineshttp://www.neok12.com/php/watch.php?v=zX5 d6f5f6f6807494046007b&t=Simple-Machines

7. MA example MA = Fo/Fi ▫You apply 20N to a lever to lift a 144N weight.  What is the mechanical advantage?

8. Homework Work through the worksheet. Read pg. 280-282, 284-286