Unit 3 Simple Machines SEDL Sedl Form

Instructions and help about Unit 3 Simple Machines SEDL Sedl

[Music] what is a pulley sometimes it is not easy to lift heavy objects with only human force this problem can be fixed with the help of a simple machine like a pulley what is a pulley a basic pulley comprises of a wheel on a fixed axle with a groove along the edges to guide a rope or a cable [Music] the load is the weight of an object an effort the amount of force required to lift or move this object when you put two or more wheels together and run a rope around them you have created a great lifting machine as you add more pulleys you increase your mechanical advantage and it becomes very easy to lift the same load the trade-off is that as you increase the number of pulleys you require a greater amount of rope to achieve the same result [Music] hence by decreasing the effort needed to lift the load you have to apply the force for a longer period of time [Music] the wheel and axle when we have to move a real heavy load we have to use a great deal of force to push it this is because of