Free-body diagram 25 25 Figure 4.13 Since motion and friction are parallel to the slope, it is most convenient to project all forces onto a coordinate system where one axis is parallel to the slope and the other is perpendicular (axes shown to left of skier). N is perpendicular to the slope and fis parallel to the slope, but W has components along both axes, namely Wi and W |- N is equal in magnitude to W1 , so that there is no motion perpendicular to the slope, but f is less than W | so that there is a downslope acceleration (along the parallel axis).

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Newton's Second Law

Newton’s laws of motion describe the relationship between the motion of an object and forces acting on it. Newton’s law of motion has two types as follows: