Suppose you are standing on a train accelerating at 0.20g. What minimum coefficient of static fricti

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Suppose you are standing on a train accelerating at 0.20g. What minimum coefficient of static friction must exist between your feet and the floor if you are not to slide? .
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Why is the Fs not considered negative in the x direction?

yanetflores-rubio
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This was unbelievably helpful... thank you so much oml

ethansabetta
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The answer is correct, but the solution is not quite right. The static frictional force is not the only force being applied to the person. The train is accelerating forward, so that is also a force being applied to the person int he opposite direction of the static frictional force. But because the person is NOT sliding, that means that the static frictional force is will always be equal to the forward force. That is why the static frictional force is equal to mass x acceleration

atlpaul
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why did you put .2g times m in the place of F sub s in the equation? I only confused on that part, but could you please explain?

devanshibarot