The lunar landing rocket "LEMDE" was use for an unintended purpode: to change the orbit so that the spacecraft circled the moon and returned. It was then used to enter the Earth's atmosphere at a safe angle and speed for reentry.
Newton's laws of motion were used to compute orbit changes that the rocket had to perform. The reaction between monomethylhydrazine and N2O4 produced the thrust needed for the rocket to work. Laws of thermodynamics are involved in rocket design. Maxwell's laws of electricity and magnetism are the basis of radio communication with Houston during the mission.