Newton's First Law states that an object will remain at rest or in uniform motion in a straight line unless acted upon by an external force. The rocket without thrust does not move, and the one with thrust does.
Newton's second law is F=ma, which means the force (F) acting on an object is equal to the mass (m) of an object times its acceleration (a). This means the more mass an object has, the more force you need to accelerate it. And the greater the force, the greater the object's acceleration.
Newton's third law states that forces are a result of interactions between two different objects - each object exerting an equal force on the other object, but in the opposite direction. The thrust forces the ship into the air, acting against gravity.