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What are some examples of helpful and unhelpful frictions?

What are some examples of helpful and unhelpful frictions?
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What are some examples of helpful and unhelpful frictions?

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User Vitruvius
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helpful friction would be the friction on something that you wanted to stop (a car) while unhelpful friction is friction on something that you want to keep going (a curling rock)
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User Abdoulsn
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