This is an example of Newton's first law: the Law of Inertia. The Law of Inertia states that an object at rest tends to stay at rest, unless an unbalanced force acts on it. Two people sitting on a couch is an example of this law because the two people are staying at rest unless an unbalanced force acts on them.
This is an example of Newton's third law: the law of Force and Acceleration. This law states that an object's acceleration is dependent on its net force and mass. A person trying to lift up an elephant is an example of this law because the mass and net force of the elephant are greater than the human's so the person will need a lot of force to lift the elephant.
This is an example of Newton's third law: the Law of Action/Reaction. The Law of Action/Reaction states that for every action there is an equal and opposite reaction. A rocket ship is acting on the atmosphere with its flames and the reaction is the rocket's movement.