Newton's 3 Laws
Newton's First Law- Rocky pushed the snail car and it moved forward because of the force he applied to it. Friction worked against the car and made it slow down and stop.
Newton's Second Law- Rocky pushed the car and this made it moved forward. If the cars mass had been bigger then he would have had to pushed the car with more force.
Newton's Third Law- The car was pushed and the force made it move in the opposite direction. If more force was applied the car would go farther in the opposite direction.