http://www.dvdhometheateronline.com/floor-pull/
You pull your 18 kg suitcase at constant speed on a horizontal floor by exerting a 38 N force on the handle, w?
You pull your 18 kg suitcase at constant speed on a horizontal floor by exerting a 38 N force on the handle, which makes an angle 44.72 with the horizontal. The force of friction on the suitcase is 27 N.
(b) What is the normal force on the suitcase?
would it just be 18*9.81*cos44.72 = 125.47
the suitcase is not accelerating vertically, so the sum of vertical forces on it sum to zero, these forces are
the vertical component of the pulling force (Psin(theta)) acting up
the weight acting down
the normal force acting up
we have
N+Psin(theta)-mg=0
N=mg-Psin(theta)
N=18kg x 9.8m/s/s -38sin44.72
N=149.7N
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