Why metals are used in automobiles?
Kinda obvious :S
Metals (usually aluminum or steel) are used in cars because they are strong and cheap. Expensive sports cars usually have stronger metals (like titanium) but that makes them more expensive. Different metals are used for different purposes, too. The main frame of a car would usually be steel instead of aluminum because it is stronger but delicate pieces would be made of aluminum because strength is not needed but it would be cheaper to make them in aluminum
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