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When is it appropriate to use vector (bold) notation? I understand the difference between vectors and scalar quantities, and always used to think an equation with a vector on the LHS needed to have a vector on the RHS, but in writing up a recent question, had this equation:

E[tex]_{kin}[/tex]=1/2mv[tex]^{2}[/tex]

which I then use to produce an equation involving momentum, p, and then the final result which is a dimensionless quantity.

Now I know energy is not a vector quantity. Does that mean it is wrong to put the velocity reference in bold?

The same goes for the expression involving momentum:

E[tex]_{kin2}[/tex]=(p[tex]^{2}[/tex])/2(m+M)

is it wrong to have the p in bold?

Thanks for any advice.

Tom