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Direction of car friction in a free-body
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[QUOTE="Stephen Tashi, post: 4952717, member: 186655"] In general, the (positive) direction of the frictional force of a surface on an object rolling over it cannot be determined without knowing whether the rolling object is "trying to slide" over the surface or trying to "trying to spin without moving". Determing the positive direction depends on the specifics of other applied forces and moment of inertia. In this problem, since the surface is flat, the wheels would spin without moving if there were no friction. The frictional force can be drawn so it opposes the motion of the surface of a tire attempting to spin across it. Theoretically, It doesn't really matter how you pick the positive direction for drawing force vectors. If you draw them pointing the wrong way, you get a negative value for their magnitude and you conclude they point in the opposite direction. [/QUOTE]
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Direction of car friction in a free-body
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