How do Wedges fasten objects?

How to Wedges fasten objects ?   Please Explain.  

This is 3rd Grade Level Question.
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naseeamAsked:
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d-glitchCommented:
The point of the wedge goes into a narrow gap in a set of loosely fitting objects.  Driving the wedge further into the gap pushes the objects apart and tightens the fit.  The resulting friction is what holds things together.
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d-glitchCommented:
Clamps and vises also hold things together with friction.  But the force comes in from the outside.
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d-glitchCommented:
A wedge is also a force multiplier.  It can provide mechanical advantage.
Take a door stop 10 inches long and 1 inch high.  If it takes 10 lb of force to drive the wedge 1/10th of an inch into the gap, it will lift the door with 100 lb of force and move it 1/100th of an inch.
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