Moment of Inertia:

mr2 is called the moment of inertia - the resistance of a mass a distance r to a change in its angular acceleration.

This is analogous to the way that inertial mass resists translational acceleration.

Inertial Mass (m) and Moment of Inertia (I) resist translational and angular acceleration.

Consider the father pushing a playground merry-go-round.

He exerts a force of 250 N at the edge of the 50.0-kg merry-go-round, which has a 1.50 m radius. (Consider the merry-go-round itself to be a uniform disk with negligible retarding friction.)

Calculate the angular acceleration produced:

(a) when no one is on the merry-go-round

(b) when an 18.0-kg child sits 1.25 m away from the center. Consider the merry-go-round itself to be a uniform disk with negligible retarding friction.

Activity 82.10

Activity 82.10

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