Newton’s laws of motion apply whether we are launching a rocket that is escaping Earth’s gravitational field or traveling through deep space. These same laws also help in understanding another important scientific principle called impulse. Impulse (a force applied for a period of time) can result in the change of an object’s velocity. This explains how rockets launch, how future landers will land on the Moon or Mars, and how astronauts survive a return to Earth.
https://youtu.be/dCF–YOjiOw