How to determine the force of friction from a graph?

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  • #26
TSny
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Note that when we write Fapplied - Ffriction = ma, then the symbol Ffriction represents the magnitude of the force of friction. That is, Ffriction represents a positive number. We take into account the negative direction of the friction force with the minus sign in Fapplied - Ffriction.
 
  • #27
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And to calculate percentage error I would do: (1.2729 - 1.5758)/ 1.5758, or ((slope experimental - slope theoretical)/ slope theoretical) without considering the force of friction?

Thank you for all the help.
 
  • #28
TSny
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Right. You should note that friction does not affect the slope of the graph, only the y-intercept.
 

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