Posted by Erin on .
A tetherball leans against the smooth, frictionless post to which it is attached.The string is attached to the ball such that a line along the string passes through the center of the ball. The string is 1.20m long and the ball has a radius of 0.120mwith mass 0.380kg. What is the force the pole exerts on the ball?
Look at the angle the string makes with the pole.
Now draw the vector diagram at the ball: mg downard, Tension along the string, and H the horizontal force.
For this angle, you can use the small angle approximation that sine and tangent are equal.