Drawing extended free-body diagram A. A ruler is placed on a pivot and held at a

Question

Drawing extended free-body diagram A. A ruler is placed on a pivot and held at an angles as shown at right. The pivot passes through the center of the ruler predict the motion of the ruler after it is released form rest. Explain your reasoning Check your prediction by observing the demonstration 1. Is the angular acceleration of the ruler in a clockwise sense, in a counterclockwise sense or zero? Explain how you can tell. what does your answer imply about the net torque on the ruler about the pivot? expalin 2. What is the direction of the acceleration of the center of mass of the ruler? If a_cm = 0, State that explicitly. Explain how you can tell What does your answer imply about the net force acting on the ruler? Explain

Explanation / Answer

I.

A.

The situation in the figure shows the in equilibrium of the ruler about pivot, after removing torque applied in clockwise direction the ruler try to rotate in counter clockwise to get equilibrium.

1.

As the ruler try to move in counter clockwise direction the angular acceleration in counter clockwise direction. The applied torque is in clock wise direction.

The net torque on the ruler is initial applied torque.

2.

The acceleration of the centre of mass is zero as there is no external force acting on the centre of mass.

There is no net force acting on the ruler as it has no linear motion.

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