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why is friction helpful
when is friction helpful
three reasons why friction is needed
in what ways can friction be helpful
when is friction useful
situations where friction is useful
importance of friction in our daily life
what are the advantages of friction
why is friction helpful, when is friction helpful, three reasons why friction is needed, in what ways can friction be helpful, when is friction useful, situations where friction is useful, importance of friction in our daily life, what are the advantages of friction
