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A motorcycle moves around a vertical cir...

A motorcycle moves around a vertical circle with a constants speed under the influence of the force of gravity `vec(W)`, friction between wheel and track `vec(f)` and normal reaction between wheel track `vec(N)` :
`{:(,"Column-1",,"Column-2"),("(A)","Constant magnitude","(P)",vec(N)),("(B)","Directed towards centre when value in non-zero","(Q)",vec(N)+vec(f)),("(C)","Total reaction force by track","(R)",vec(f)+vec("w")),("(D)","When motion is along vertical the value is zero","(S)",vec(N)+vec("w")+vec(f)):}`

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The correct Answer is:
A-S; B-P, S; C-Q; D-R
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