Force on object moving on a curve

Jun 2010
422
33
NC
Curve tangent and normal

You have to determine the unit vectors normal to the path.

Set a function as, phi = x^^2 - 2by

Now grad(phi) = d(phi)/dxi + d(phi)/dyj
Then, n = grad (phi)/ |grad(phi)|
and for t, swap the n coefficients i and j.

Goes something like that....