How solid motor propulsion work?

Solid motor propulsion works by burning a solid fuel mixture contained within a combustion chamber. When ignited, the fuel generates high-pressure gas that expands rapidly and is expelled through a nozzle, producing thrust in the opposite direction, according to Newton's third law of motion. The design allows for a simple, reliable, and efficient propulsion system, commonly used in rockets and missiles. Once ignited, solid motors cannot be throttled or shut down, making them suitable for specific applications where consistent thrust is required.