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How is mechanical advantage of wheel and axle found?

My science teacher gave me homework about simple machines. I can not find the formula in my book or online.


Normally we think of the axle driving the wheel, so it is actually a mechanical DISadvantage and a speed advantage. You have to know the radius of the applied force on the axle, which often involves a gear or pulley. But if you are told the torque force at the surface of the axle, then you take the ratio of the axle diameter to the wheel diameter - for example, a 2.4 inch axle with 100 pounds of torque at the surface would have a 1:10 disadvantage (or 1/10 advantage) to a 24 inch wheel and would apply 10 pounds of force at the rim of the wheel. If you are given the torque in inch-pounds or foot-pounds then you have to take the two different radii into account to get actual force.
May 28, 2018
If the advantage is more than one (1), you need less effort.
May 28, 2018

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