Levers and Pulleys: How Machines Multiply Force
How can one person move a load that would be impossible to lift directly? Levers and pulleys change how an applied force acts, perhaps by changing its size, direction or the distance over which it acts. The central puzzle is how this advantage can exist without creating energy or reducing the total work in an ideal machine. The answer lies in the relationship between force and distance.
This lesson just one in the category Physics. To access this lesson you need to have a valid learner account, ask your parent to register you now.