Linear Motion — Chapter Three: Force and Motion

About this lesson

This unit introduces Newton's three laws of motion, starting with the concept of force as an external influence that changes or attempts to change an object's state of motion or direction. It explains Newton's first law (inertia), defines momentum as mass times velocity, and then covers Newton's second law, which relates force, mass, and acceleration (F=ma). The unit also discusses Newton's third law, emphasizing action-reaction pairs. It includes life applications such as car collisions, falling into water, and airbags, and mentions the rocket's operation as a scientific application. By the end, students should be able to recognize force, state Newton's laws, explain inertia, define momentum, apply the force-mass-acceleration relationship, and explain phenomena using these laws.