Thread: Physics Problem
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Unread 28-11-2004, 20:43
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Re: Physics Problem
if the situation is completely free of friction, then the second sphere will not rotate, and rotation won't even be figured in the picture. If muKn for the ball to the sphere is 0 and muKn for the ball to the other ball is infinite (it transfers energy whenever touching), you assume that all rotational energy is transferred, and it becomes a rotational energy problem. Sorry, I forgot physics (I took AP last year, and I didn't understand rotation to begin with), but I think I=2/5mR^2 (for a sphere) and tau = I alpha. Make energy considerations involving energy, rotational (1/2 * I * omega^2) and translational (K = 1/2 mv^2). If the collision is elastic and the finishing rotational energy for both spheres is constant R1 + R2 = Rinitial, it becomes an easy problem, since K1i + K2i = K1 + K2.
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