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because they are very important to the world and we use them everyday such as a wheel and axle that are used on doorknobs.
A screw is the simple machine which holds two boards together. In this case it is not acting as a machine though.
Simple machines can be used to transport things.
a quern is a simple machine that is used to grind corn. it has a lever which is used to grind corn.
That would be a wedge.
fasten?
There are six simple machines.The PulleyThe Inclined PlaneThe Wheel and AxelThe LeverThe ScrewAs you know a screw is used to hold things into place. So the screw is the answer.
A ramp can be considered a simple machine. It is a slanted surface that is often used to move things.
A screw may be used to fasten things together, or to wedge things apart.
A knife is actually a compound machine as it is both a wedge (the cutting edge) and a lever (as it is normally used in cutting things).
well it is a lever bacause a lever is used to adjust things
well it is a lever bacause a lever is used to adjust things
All screws are used as simple machines.
A wedge Ex:axe ,sledge hammer, those types of things.
A flying machine used to transport people and things. In geometry, a two-dimensional object of limitless dimensions.
pulley
A pulley.