Finding Acceleration With Forces At Angles

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where we see how to find the acceleration of an object when there are forces at angles and we need to use the coefficient of friction.
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3:50
This is not correct. Fn = 15 * 9.8 - 85sin(40)
not Fn = 15 * 9.8 - sin(40) * 15 * 9.8

GarboTheSloth
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for fy, why is multiplied by 15kg*9.8m/s^2?? Shouldn't it be sin(40)*85N??

junkim
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