give 5 examples where friction is not useful?
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Writing with your Parker fountain pen on a poorly finished wall. 3.) During space craft re-entry, atmospheric friction is an evil to the spacecraft and heat shields are a must
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For example, friction between our shoes and the floor stop us from slipping and friction between tyres and the road stop cars from skidding. Friction is sometimes unhelpful. For example, if you don't lubricate your bike regularly with oil, the friction in the chain and axles increases.
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