Answer to Question #206438 in Physics for Luyanda

Question #206438

A 20 kg box is pushed up a rough sloping ramp (30o relative to the incline) with a force of 300 N, parallel to the horizontal with constant speed. what is frictional force



1
Expert's answer
2021-06-13T11:29:47-0400

Let's apply Newton's Second Law of Motion in projection on "x"-axis:


"F_{p}-mgsin\\theta-F_{fr}=0,""F_{fr}=F_{p}-mgsin\\theta,""F_{fr}=300\\ N-20\\ kg\\cdot9.8\\ \\dfrac{m}{s^2}\\cdot sin30^{\\circ}=202\\ N."

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