To reduce the firction between two objects or surfaces we can use the following methods:
• Make the surfaces or objects smoother. This comes from the fact that if the material is rougher then it will produce more friction while if the material is smoother the friction will decrease.
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• Lubricate the objects or surface. A lubricant can reduce the friction between two objects or surface.
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• Reduce the contact between the object or surfaces. The more contact there is the more friction it will make; that's why we use round wheels.