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Introductory Physics Homework Help
The inelastic collision between a disk and a rotating platform
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[QUOTE="Leo Liu, post: 6338334, member: 660839"] [B]Homework Statement:[/B] A FR question in 2019 AP Physics C Exam (Version 2) [B]Relevant Equations:[/B] Rotational Kinetic Energy, Conservation of Angular Momentum A disk is dropped on a platform rotating at a constant angular speed ##\omega_i## as shown below. [ATTACH type="full" alt="1588882549551.png"]262291[/ATTACH] The question asks whether the final kinetic energy of the platform is conserved. I understand the angular momentum is always conserved provided that the net torque is 0, so I wrote the following equation: $$I_{platform} \omega_i = (I_{platform}+I_{disk}) \omega_f$$ From this I inferred that ##\frac 1 2 I_{platform} {\omega_i}^2 \neq \frac 1 2 (I_{platform}+I_{disk}) {\omega_f}^2##. My questions are as follows: Why is the energy not conserved in the collision, and how is the energy dissipated? Thank you in advance. [/QUOTE]
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Introductory Physics Homework Help
The inelastic collision between a disk and a rotating platform
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