What do you mean by electromagnet induction?under what condition is this phenomenon possible?

Electromagnetic induction is a phenomenon in which a changing magnetic field across a loop of wire results in the generation of an induced emf. When there is relative motion between a magnet and the coil, magnetic flux changes and hence an electromotive force is generated in the coil.

moving ball hits still ball. mover stops, hit ball moves. momentum transfer.

it doesn't. it was imagined up in the middle ages.