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Explain how a screw driver could be used as a lever and as a wheel and axle device.


A screw driver can quite easily be used as either a lever or as a wheel and axle device.

The most usual use of a screw driver is as a wheel and axle device.  When you twist a screw driver to drive a screw, you are using its handle as the wheel and the shaft of the screw driver as the axle.  You don't get much mechanical advantage because your wheel is hardly wider than your axle.

It's not uncommon to use a screw driver as a lever either.  If you stick the end in between two things and try to pry them apart that way, you're using the screw driver as a lever.

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