Question

state in your own words why friction is sometimes friendly and sometimes unfriendly​

Answer 1

Explanation:

Friction can be both friend and foe. FRIEND: 1 It helps in construction of buildings. 2 It helps in walking on the ground. FOE: 1 soles of shoe and tyres of vehicles wear out due to friction. 2 friction can also produce heat. so it can damage the machines

Answer 2

Answer:

friction is sometimes friendly because sometimes it is useful for example when we walk we want friction , so it is friendly.

friction is sometimes unfriendly because for example if friction is more it is very hard to move a vehicle so to decrease it we apply lubricants .

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