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Angular momentum and its properties were devised over time by many of the great minds in physics Newton and Kepler were probably the two biggest factors in the evolution of angular momentum Angular momentum is the force which a moving body following a curved path has because of its mass and motion Angular momentum is possessed by rotating objects Understanding torque is the first step to understanding angular momentum Torque is the angular version of force The units for torque are in Newton-meters Torque is observed when a force is exerted on a rigid object pivoted about an axis and This results in the object rotating around that axis The torque due to a force F about an origin is an inertial frame defined to be r x F1 where r is the vector position of the affected object and F is the force applied to the object To understand angular momentum easier it is wise to compare it to the less complex linear momentum because they are similar in many ways Linear momentum is the product of an objects mass and its instantaneous velocity The angular momentum of a rotating object is given by the product of its angular velocity and its moment of inertia Just as a moving objects inertial mass is a measure of its resistance to linear acceleration a rotating objects moment of inertia is a measure of its resistance to angular acceleration2 Factors which effect a rotating objects moment of inertia are its mass and on the distribution of the objects mass about the axis of rotation A small object with a mass concentrated very close to its axis of rotation will have a small moment of inertia and it will be fairly easy to spin it with a certain angular velocity However if an object of equal mass with its mass more spread out from the axis of rotation will have a greater moment
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