A 1.0 kg magnetized air puck moving across a level table at 0.24 m/s approaches head-on a stationary, similarly magnetized air puck of mass 0.50 kg. If the "magnetic collision" is repulsive and perfectly elastic, determine: (a) the velocity of each puck after the collision (b) the velocity of both pucks at minimum separation (c) the total kinetic energy at minimum separation (d) the maximum potential energy stored in the magnetic force field during the collision For A) i simply used the conservation of momentum and KE and found the final velocities (1-dimensional) For B) I am not sure how to find th miniimum distance
Hint: When the pucks are as close to each other as they get, what's the relationship of their velocities?
Exactly! (If the velocities weren't the same, then they'd keep getting closer.) So figure out what that velocity must be.
ahh k..so for part c its quite staight foreward. we have to use0.5(M1+M2)V2 For part d potential enegy will be max when the h is max. How do we find the h..?
Right. What do you mean by "h is max"? Just use the fact that total energy is constant. Yes. (It's a "head-on" collision.)
yes so M2v2^2 will 0..i know that hence the initial total energy will be 0.5*M1v1^2= 0.0288J. so then we can subtract the KE (from part c)frm this energy to find the PE