https://www.khanacademy.org/science/ms-physics/x1baed5db7c1bb50b:motion-and-forces/x1baed5db7c1bb50b:connecting-motion-and-forces/a/forces-and-acceleration 2026-04-27T10:10:46.754795089Z Learn and try: Connecting motion and forces Use a simulation to investigate the effects of balanced and unbalanced forces on an object's motion. Explore how an object's acceleration is affected by the net force acting on it and its mass. article https://www.khanacademy.org/science/cambridge-o-level-physics-cie/x0e04e0cb682fb793:forces/x0e04e0cb682fb793:action-and-reaction-force/a/forces-and-newtons-third-law 2026-05-01T13:40:34.883034315Z Learn and try: Forces and Newton's third law Forces always exist in pairs. Explore how the forces in these pairs compare to each other, and why they don't balance each other. article https://www.khanacademy.org/science/ms-physics/x1baed5db7c1bb50b:teacher-resources/x1baed5db7c1bb50b:hands-on-physics-activities/a/activity-how-can-a-skydiver-fall-safely 2026-02-27T18:00:31.886851552Z Activity: How can a skydiver fall safely? Make science come alive in your classroom with this free hands-on activity aligned to middle school standards. article