Newton's Laws - Tetherball on a pole

  • Thread starter Trojanof01
  • Start date
  • #1
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A tether ball leans against the post to which it is attached (Fig. 5-40). If the string to which the ball is attached is 2.00 m long, the ball has a radius of 0.300 m, and the ball has a mass of 0.400 kg, what are the tension in the rope and the force the pole exerts on the ball? Neglect any friction between the ball and the pole. (The string is attached to the ball such that a line along the string passes through the center of the ball.)

Find the Tention in the Rope

Find the Force of pole on ball

My work:

http://i14.tinypic.com/5xh73pf.jpg

Biggest problem has been trying to set up the free body diagram? Does it look right? How about the answers?

edit: sorry for poor quality, my scanner blows
 

Answers and Replies

  • #2
Doc Al
Mentor
45,248
1,596
Since there's no friction between ball and pole, the force of the pole must be perpendicular to the pole (and ball surface). Redo your FBD.
 

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