write 3 ways each of 1) reducing friction 2)increasing friction
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less force , less friction
more force, more friction
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Ways to increase friction
1. Surfaces are made rough by grooving them to increase friction.
2. Sometimes sand is used to make a surface rough.
3. By increasing the weight of the moving object.
Reducing the friction
1. Polishing makes surfaces smooth and reduces friction.
2. Roads are cemented in order to make them smooth.
3. Oils and grease are used on machine parts to protect them from friction and increase their life.
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