Moment of inertia Inertia First law of motion

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Moment of inertia

Moment of inertia

Inertia • First law of motion ( Law of Inertia) • It states that

Inertia • First law of motion ( Law of Inertia) • It states that every body continues in its state of rest or of uniform motion in a straight line unless it is compelled by an external agency acting on it. This leads to the definition of force as the external agency which changes or tends to change the state of rest or uniform linear motion of the body. • Inertia: the property of matter to maintain its state of rest or uniform motion and requiring a net force to change the state is called Inertia. In other words, inertia of a body is its reluctance to start moving and its reluctance to stop after it has begun moving.

MOMENT OF INERTIA • Moment of Inertia: The concept of moment is inertia is

MOMENT OF INERTIA • Moment of Inertia: The concept of moment is inertia is introduce to express the rotation motion. • Equilibrium: the state of a body in which, under the action of several forces acting together, there is no change in translation motion as well as its rotational motion is called equilibrium. • A body is in translation equilibrium if it is at rest, or is moving at constant speed in a straight line. • it is in rotational equilibrium if it is rotating constantly at constant angular speed about a fixed axis.

 • TORQUE: When single force acting on a body tends to produce rotation

• TORQUE: When single force acting on a body tends to produce rotation or change in rotation, the force is said to exert Torque. It is also called moment of force. • The torque exerted by a force F • applied at a point A having position of vector r with respect to the pivot O defined as • Ƭ = r x F = r. F sinϴ ň

 • Moment of inertia is the mass property of a rigid body that

• Moment of inertia is the mass property of a rigid body that determines the torque needed for a desired angular acceleration about an axis of rotation. Moment of inertia depends on the shape of the body and may be different around different axes of rotation.