Question

answer the question​

Answer 1

e) Ball bearings are used in machines

Ball bearings are used in machines to convert the sliding friction to rolling friction because sliding friction needs more power than rolling friction and makes it easy to run the machine.

REFER the ABOVE ATTACHMENT to get the diagram of ball bearings

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Answer 2

Answer:

1. ball bearings are used in machines to reduce friction and thus reducing heat on the rotating parts and enhance their life

2. tyres of vehicles are changed regularly to increase friction to avoid skidding

3. Machine parts are oiled ang greased to reduce friction to reduce wear out of rotating parts

4. Boats, aeroplanes and sports car bodies are streamlined to reduce air resistance and improve efficiency

5. metal chains are rapped on tyres when they run on icy roads to increase road grip to avoid skidding

6. rollers are used to transport luggage to reduce friction so that with less effort or man power heavier objects can be moved