Angular Kinetics
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| Angle equivalent to mass? | Moment of Inertia
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| Angular analogue to mass / inertia | Moment of Inertia
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| what does it have resistance to? | angular acceleration
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| what might affect a rotating object? | Distance of mass to the axis of rotation
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| EX of distance of mass to the axis of rotation | swing straight arm vs swing bent arm
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| Moment of inertia | n
I= ∑ m x d^2
i=1
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| Which axis is it easier to rotate the forearm? | Longitudinal axis, supination/pronation
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| Values characterized by using the formula | I = m x k^2
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| Radius of gyration (k) | represents the objects mass distribution with respect to a axis of rotation
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| About which axis is the moment of inertia the smallest? | Longitudinal - arms down
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| Angular momentum | H = I x ω = (mk^2) x ω
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| Conservation of angular momentum | will remain constant as long as there is no external torque(s)
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| If gravity is the ONLY external force and there is NO external torque | Angular momentum is conserved
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| Is angular momentum a vector? | yes
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| when a body is on the air, if the angular momentum of one body part is increased | then all or part of the rest of the body must experience a decrease in angular momentum
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| while on the air angular momentum is conserved | but it can be transferred
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| Angular impulse | (I x ω)Before + ΣT∆t = (I x ω)After
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| Angular impulse | ΣT∆t
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| 1st law of angular motion | A rotating body will maintain a state of constant angular motion unless acted upon by some net external torque
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| 2nd law of angular motion | A net external torque produces angular acceleration of a body that is directly proportional to the magnitude of the net torque, in the same direction as the net torque, and inversely proportional to the body’s moment of inertia (ΣT = I⍺)
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| 3rd law of angular motion | For every torque exerted by one body on another, there is an equal and opposite torque exerted by the second body on the first
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Created by:
rmart11
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