I need to determine maximum tension/down force with a pendulum.

Question

I need to use the lightest string possible to:
-support a 16kg bob, with
-a velocity of 4m/s
-with a swing radius of 2m
-at it's equilibrium (ie 0 degrees)
-given standard gravity.

using T=m(V^2/r)+(g*cos(x))

The problem is as the swing radius (r) decreases then T increases.

But logic tells me it is opposite of this. What am I missing?

Thanks

Answer 1

also, any ideas of finding the exact gravitational force / gravitational acceleration data for my location?

Answer 2

no takers?