A uniform slender bar with mass, m, is shown below. The block is suddenly removed. Pin A is frictionless. Find: a) The initial angular acceleration of the bar b) The force reactions at point A when the rod reaches the horizontal position

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Moment of Inertia

Inertia can be termed as a resistance offered by a body to change its state. A rigid body initially at rest will apply resistance when acted by an external force that tends to change its state of rest or velocity, or a body initially at motion will provide resistance in changing its state of velocity or motion for coming to a state of rest. In other words, Newton's first law of motion describes the law of inertia of a rigid body.