# Ex 1.21 The dumbbell

Consider two massive particles in the plane constrained by a massless rigid rod to remain a distance $l$ apart, as in figure 1.5.

a. Write Newton’s equations for the balance of forces for the four rectangular coordinates of the two particles, given that the scalar tension in the rod is $F$.

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[guess]

$\displaystyle{m_0 \ddot y_0 = F \sin \theta}$

$\displaystyle{m_0 \ddot x_0 = F \cos \theta}$

$\displaystyle{m_1 \ddot y_1 = - F \sin \theta}$

$\displaystyle{m_1 \ddot x_1 = - F \cos \theta}$

[guess]

— Me@2021-04-04 03:51:05 PM

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