Why is it so easy for you to use a screw driver to loosen/tighten screws, but nearly impossible/very hard to do it with just your hand?
In: Physics
The handle of the screwdriver is what makes it easier. If the handle was the same diameter as the screw, it wouldn’t be any easier (except that it might be easier to grip it so you could apply more force). Since the diameter of the handle is larger than the screw, you can apply more torque and then turning the screw becomes easier.
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