The accompanying figure shows a frictionless channel in the shape of a segment o

Question

The accompanying figure shows a frictionless channel in the shape of a segment of a circle with center at "O". The channel has been anchored to a frictionless horizontal table top. You are looking down at the table. Forces exerted by the air are negligible. A ball is shot at high speed into the channel at "p" and exits at "r.

Consider the following distinct forces.

1. A downward force of gravity.
2. A force exerted by the channel pointing from q to O.
3. A force in the direction of motion.
4. A force pointing from O to q.

Which of the above forces is (are) acting on the ball when it is within the frictionless channel at position "q"?

(A) 1 only.

(B) 1 and 2.    

(C) 1 and 3.

(D) 1, 2, and 3.

(E) 1, 3, and 4.

Which path in the figure below would the ball most closely follow after it exits the channel at "r" and moves across the frictionless table top?

Explanation / Answer

i (B) 1 and 2.


ii (B)

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