Newton's Third Law of Motion [IB Physics SL/HL]

This video provides an in-depth explanation of Newton's Third Law of Motion, stating that for every action, there is an equal and opposite reaction. It elaborates on the concept of force pairs, emphasizing that these forces are equal in magnitude but opposite in direction and act on different objects, preventing them from canceling out. The law is demonstrated through various applications, including a hammer striking a nail, gravitational forces between Earth and an object, and the propulsion of rockets. A detailed example calculates the initial acceleration of a rocket based on the mass of the rocket and the expelled gas. The video further applies Newton's Third Law to multi-mass systems like Atwood's machine, illustrating how to analyze such systems by considering individual masses or treating them as a single combined system to simplify calculations by ignoring internal forces like tension. The explanation concludes by summarizing the core principles and applications of Newton's Third Law.