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    Hi everyone just about to start OCR advancing physics coursework on how the mass of a trolley affects the friction of the trolley i tried using some formulas today but they didnt seem to work so if anyone has done this coursework can you HELLLLLP PLEASE need ideas on how to calculate the friction
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    bear in mind that your task is to investigate what the relationship is. An investigation is an exploration of the unknown.

    when you have got your results and seen what patterns there are then you can use physical principles to attempt to explain them.
 
 
 
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