In which of the following cases is friction a disadvantage to us ?

Running

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Baking

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Writing with a pencil

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Parts of a machine rubbing against

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Solution

The correct option is C Parts of a machine rubbing against
- In running, friction is necessary, without friction we can't run.

- In breaking, friction is advantageous.

- Writing with pencil, friction is necessary so that the dark mark will be formed.

- But in case of machine parts, rubbing it generates heat and it may be damaged. It reduces the efficiency of machine.

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