Question

l bearing Sliding friction Metallic devices used to reduce friction between two surfaces Frictic object Static friction Frictic from Friction offered by fluids A very soft and smooth non-metal Materials used to decrease friction Treading Grog frictic ncants Rolling friction Friction between two rolling objects Wear and tear Loss EXERCISE A. Fill in the blanks. 1. Friction depends upon the 2. Force of sliding friction is 3. When an object starts moving from rest, of the sliding surfaces. than static friction, friction comes to p Effectual Science Vill

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Answer 1

Explanation:

1. By using lubricants: friction increases as the roughness of the surface increases. Lubricants fill the fine pores and gaps between contact surfaces and reduces friction

2. Polishing surfaces: It makes the surfaces even and hence reduces friction

3. By using ball bearings: Rotating machines can be mounted on ball bearings. Rolling friction is lesser than sliding friction

4. By streamlining: streamlining reduces the area of contact and thus reduces friction

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