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A zipper is not considered a pulley. It is considered a wedge because it has to wedge two things together, as wedge itself in to pry them apart.
a screw is basically an inclined plane wrapped around a pole, and an inclined plane is basically a ramp. a wedge is a double sided inclind plane and is mainly used to split things apart
A wedge
A wedge is used to take advantage of the fact that work done = force x distance.Simply put if you need to force two points apart a wedge allows you to use less force by moving a greater distance.If you knock a wedge into a piece of material by 10cms in order to widen the gap by 2cms it will take one fifth of the force to achieve this.If you think of a screw as being a nail with a very long wedge wrapped around it, you can force this into a solid piece of wood with one hand simply by taking advantage of the mechanical advantage that this wedge provides.
Things that force things to separate include natural:iceflowing or rushing watergravityAnd manmade:wedgestools with a wedge
a wedge splits or cuts an object
a wedge splits or cuts an object
A wedge is used for pushing things apart.
A zipper is not considered a pulley. It is considered a wedge because it has to wedge two things together, as wedge itself in to pry them apart.
A screw may be used to fasten things together, or to wedge things apart.
It forces things to be apart and most wedges have a pointy tip to force things to be apart. For example: You use a knife to chop off half of a cucumber. you see how strong the knife is to seperate the cucumber. Now you see how essential a wedge is to somethings. I just showed you another example of how it works and also you learned that a knife can also be a wedge.
knife
Because your teeth splits food into pieces, just as metal wedges does to wood.
When a wedge is driven between two parts, the parts are driven apart.
a screw is basically an inclined plane wrapped around a pole, and an inclined plane is basically a ramp. a wedge is a double sided inclind plane and is mainly used to split things apart
Wedge
The sword is an edged weapon that uses the action of a wedge to push "stuff" apart as it cuts through it.