Which component of the star wars movies is possible according to our current understanding of physics?

The movie Star Wars is a space opera interstellar epic which uses science and technology in its settings and storylines, although its main focus is not necessarily on science.

Many elements in the films appear to defy simple laws of physics.
One of which is the falling of spaceships when they are hit by a laser beam. Experts said, this is one good example because without gravity in space, ships should travel in the direction of the impact instead of dropping like a stone.