A board of length 2d = 6 m rests on a cylinder (the “pivot”). A ball of mass 5 kg is placed on the end of the board. Figure 11.106 shows the objects at a particular instant. (a) On a free-body...

A board of length 2d = 6 m rests on a cylinder (the “pivot”). A ball of mass 5 kg is placed on the end of the board. Figure 11.106 shows the objects at a particular instant.

(a) On a free-body diagram, show the forces acting on the ball + board system, in their correct locations.

(b) Take the point at which the board touches the cylinder as location A. What is the magnitude of the torque on the

system of (ball + board) about location A?

(c) Which of the following statements are correct?

(A) Because there is a torque, the angular momentum of the system will change in the next tenth of a second.

(B) The forces balance, so the angular momentum of the system about location A will not change.

(C) The force by the cylinder on the board contributes nothing to the torque about location A.