Engineering Mechanics
The ideal angle of banking provided on the curves on roads depends upon

Coefficient of friction between the road and vehicle contact point
Nature of the road surface
Weight of the vehicle
(Velocity)2 of the vehicle

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Engineering Mechanics
Non-coplanar concurrent forces are those forces which

Meet at one point and their lines of action also lie on the same plane
Meet at one point, but their lines of action do not lie on the same plane
Do not meet at one point and their lines of action do not lie on the same plane
Do not meet at one point, but their lines of action lie on the same plane

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