Centripetal Force

Slinkys can also be used to ddemonstrate centripetal force.
Newton's first law says that an object will continue in motion in a straight line unless a force acts to change the motion.
When the motion of a ball or Slinky is in a circle, the force is named the Centripetal Force. This Centripetal force is a part or component of the tension force that supports the slinky as it swings around in a circle and it equals:
F (centripetal) = ((mass*velocity 2 )/radius) = 4*pi*mass*radius/T 2
In an experiment, one measures the angle of swing of the slinky [in this example about 40 degrees], the period or the time for one revolution, called T, and the radius.
the angle = _________________
the period, T = _____________
the radius, R = _____________

F (centripetal) experimental = m*g*tan(angle)
F (centripetal) theoretical = 4*pi*m/T 2
The mass, m, is the same in each case!
Does F (centrifugal) experimental = F (centrifugal) theoritical?
% of error = ????
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