My main goal was the find the angular acceleration of the seesaw.(adsbygoogle = window.adsbygoogle || []).push({});

The swing bar of mass is pivoted at a different point, as shown in the figure.

Find the magnitude of the angular acceleration of the swing bar. Be sure to use the absolute value function in your answer, since no comparison of m1 ,m2, mbar and has been made.

So naturally, I tried to find the moment of inertia

The inertia of the bar is 1/12m_bar(L)^2

The inertia of the two masses are (m_1)*(l/3)^2+(m_2)*(2*l/3)^2

Adding together the total inertia is

(m_bar/12)*(l/3+2*l/3)^2+(m_1)*(l/3)^2+(m_2)*(2*l/3)^2

where l/2 and 2l/3 are the radiuses that are away from m1, m2, respectively.

But unfortunately, this is not the correct answer.

I also tried to find the net torque. And this should be in absolute value because m2 and m1 are not given.

So I thought it was abs(g*(m_1*l/3-m_2*2*l/3)) but it was wrong.

This problem is driving me crazy! I would appreciate any help.

Thank you

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# Homework Help: Seesaw Problem

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