A rigid bar is free to rotate about a fixed pivot point through its center. The

Question

A rigid bar is free to rotate about a fixed pivot point through its center. The axis of the rotation of the bar is perpendicular to the plane of the paper. A force Fo is applied to the end of the bar as shown. The force is always at right angles to the bar. For each of the following cases, determine whether the angular acceleration would be in a clockwise or counterclockwise sense.

1) The bar was initially at rest.

2) The bar was spinning at a constant rate. Does your answer depend on which way the bar is spinning? Explain.

Explanation / Answer

1. Counterclockwise

2. Counterclockwise

[No, it does not depend on the initial condition, it only depends on the direction of torque being applied.]

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