Pulleys are simple machines that helps us lift heavy objects.If I have two pulleys and the load weighs 100 lbs. it goes down to 50lbs but you have to pull twice as far.Here are some examples of pulleys: escalator, flagpole, and a conveyor belt. At grocery stores they have a conveyor belt.Pulleys can also roll things like food,empty lunch trays...almost anything! Most pulleys are circles or ovals. Pulleys can also be used on cranes. A pulley is really a type of wheel. Pulley were invented in Sicily in 250 B.C. Aren't pulleys fun to learn about?Friday, November 19, 2010
Pulleys by Patrick
Pulleys are simple machines that helps us lift heavy objects.If I have two pulleys and the load weighs 100 lbs. it goes down to 50lbs but you have to pull twice as far.Here are some examples of pulleys: escalator, flagpole, and a conveyor belt. At grocery stores they have a conveyor belt.Pulleys can also roll things like food,empty lunch trays...almost anything! Most pulleys are circles or ovals. Pulleys can also be used on cranes. A pulley is really a type of wheel. Pulley were invented in Sicily in 250 B.C. Aren't pulleys fun to learn about?
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