Identify and draw external forces in each case: systems are (a) beam, (b) sign. Smooth surface contact at A. Mass m P- 2 B Bx A Weng M Fc-400 N 2 -2 m Fr=350 N <=400 2 m - Three supporting cables exert the forces shown on the sign - Neglected mass - Neglected force at O 8(1-3

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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.