topic 2.2 extended g – rotational dynamics r f consider a particle of mass m constrained to move...
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Topic 2.2 Extended G – Rotational dynamics The moment of inertia for a group of point masses about a given axis is I = mr 2 M OMENT OF I NERTIA Rotational Inertia Point Masses Calculate the rotational inertia of the masses about the axis shown. 1 kg 4 kg 2 kg 2.5 m 2.0 m 1.0 m I = Σmiri2I = Σmiri2 = 1· · ·3 2 = 49.5 kg·m 2 If a torque of 15 nm was applied to the axis, what would the rotational acceleration be? τ = Iα 15 = 49.5α α = rad/s 2