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BBRadiation
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I am having a difficult time understanding the reasoning behind torque. From a textbook I read,
However, why is it that it's easier to rotate a door when you are farther from the rotational axis? You are still moving the same amount of mass. Of course, I know that torque = r x F and thus increasing r decreases F if you are to maintain the same torque. But why is this true? What property of the object rotating explains this?
Thanks
"A doorknob is located as far as possible from the doors hinge line for a good reason. If you want to open a heavy door, you must certainly apply a force; that alone, however, is not enough. If you apply your force nearer to the hinge line than the knoe, or at any angle other than 90, to the plane of the door, you must use a greater force to move the door than if you apply the force at the knob and perpendicular to the door's plane."
However, why is it that it's easier to rotate a door when you are farther from the rotational axis? You are still moving the same amount of mass. Of course, I know that torque = r x F and thus increasing r decreases F if you are to maintain the same torque. But why is this true? What property of the object rotating explains this?
Thanks