Kinesiology 2241A/B Lecture Notes - Lecture 20: Moment Of Inertia, Angular Velocity, Momentum
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13 Oct 2018
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Angular momentum a measure of how hard it will be to stop the object rotating. Angular momentum: the rotational inertia of an object multiplied by its angular velocity: Rotational motion in the object: (similar to linear momentum) Radius of gyration: how it"s used to find the rotational inertia: But alpha =(w2-w1)/(t2-t1) so we multiply by i to get: ***therefore, torque is the time rate of change of angular momentum. Angular momentum: just like torque, angular momentum is a vector: Magnitude is rotational inertia times angular speed direction is the axis of rotation point of application is the axis of rotation line of action is along the axis of rotation. Angular impulse: the quantity of torque times time. If rotati(cid:374)g with a(cid:374)gular (cid:373)o(cid:373)e(cid:374)tu(cid:373) l1 a(cid:374)d a(cid:374) a(cid:374)gular i(cid:373)pulse is applied to you for a(cid:374) a(cid:373)ou(cid:374)t of ti(cid:373)e t, then you end up with a new angular momentum l2.
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