These two problems are based one some data from an experiment. Of course, experiment often don't carry out perfectly matching theory... And I'm having some difficulty understanding the answer.(adsbygoogle = window.adsbygoogle || []).push({});

Problem:

The following information applies to the next two problems

An experiment consists of pulling a heavy wooden block across a level surface with a spring force meter, the constant force for each try is recorded, as is the acceleration of the block. The data are shown below.

Force F in Newtons:_____3.05__|__3.45__|__4.05__|__4.45__|__5.05

Acceleration a in m/s^{2}:___0.095_|__0.205_|__0.295_|__0.405_|__0.495

10) Which is the best value for the mass of the block?

a)3kg

b)5kg

c)10kg

d)20kg

e)30kg

11) Which is the best value for the coefficient of friction between the block and the surface?

a)0.05

b)0.07

c)0.09

d)0.5

e)0.6

Answer: 10)b 11)a

Would someone please explain the answer? THank you very much~

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# Homework Help: 2008 F=ma Olympiad Problems # 10 + 11

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