2. Pulleys Class 8D science By:Student Name May 8th 2003

3. DEFINITION A wheel with a grooved rim to guide a rope or chain that runs along the groove; used to transmit or change the direction of force http://www.light lift.com/gifs/pulley- img.gif

4. Everyday Pulleys Pulley’s are used everyday, whether you know it or not, you are using pulley’s while working out, lifting heavy loads and in car engines. http://www.alliance-leicester.co.uk/loans/images/car-large.jpg http://goworkout.pikeserver.com/photos/layout.jpg

5. Example of an everyday pulley:Work Out Machines. While working out some of the machines have pulley’s. So u pull on the bar it lifts up weights, stimulating your muscle, and your using a simple form of a pulley. http://www.pumphousefitness.com/satur017.JPG

6. Example of an everyday pulley: A car engine In a car engine they use many complicated pulleys that cannot be seen. So while your driving whether you know it or not, your using a pulley. http://www.ukcarcentres.co.uk/warranty-car.gif

7. Machanical advantage of a pulley The formula for mechanical advantage of a pulley is: MA= Force of Object Force puling down. http://www.atech.org/faculty/dunne/about/SM/images/pulley.gif

8. Mechanical Advantage Question For A Pulley If Someone is trying to lift up a rock that weighs 100 Newton's, and are exerting 10 Newton's of force what is the mechanical advantage? Would it be easier to use a pulley then just lifting it yourself? http://www.hospitalmanagement.net/images/companies/rehab/rehab_3.jpg

9. Answer for the Mechanical Advantage problem The answer is: Mechanical advantage= 10 Newtons. It is easier to use a pulley then picking up a rock with your hands. http://www.arborsci.com/images/Pulleys.jpg