https://www.khanacademy.org/science/ms-physics/x1baed5db7c1bb50b:motion-and-forces/x1baed5db7c1bb50b:forces/v/forces 2025-06-20T17:00:10.254290374Z Forces A force is a push or a pull. Types of contact forces include the normal and friction forces. Types of non-contact forces include the gravitational, electric, and magnetic forces. When two or more forces act on an object in the same direction, their effects add. In opposite directions, their effects subtract. Adding and subtracting all of the individual forces this way gives the net force on the object. If the net force is zero, the forces are balanced. If not zero, the forces are unbalanced. Mahesh Shenoy video https://cdn.kastatic.org/ka_thumbnails_cache/c12eb1bc-2efa-437c-a24e-271bfe5b4c6c_1280_720_base.png Forces A force is a push or a pull. Types of contact forces include the normal and friction forces. Types of non-contact forces include the gravitational, electric, and magnetic forces. When two or more forces act on an object in the same direction, their effects add. In opposite directions, their effects subtract. Adding and subtracting all of the individual forces this way gives the net force on the object. If the net force is zero, the forces are balanced. If not zero, the forces are unbalanced. https://cdn.kastatic.org/ka-youtube-converted/emZftp_UBKs.mp4/emZftp_UBKs.mp4 434 Forces and Newton's third law https://www.khanacademy.org/science/cambridge-o-level-physics-cie/x0e04e0cb682fb793:forces/x0e04e0cb682fb793:action-and-reaction-force/v/newtons-third-law 2025-07-01T10:10:08.145512912Z Newton's third law Forces result from interactions between objects. Newton's third law states that two interacting objects exert equal and opposite forces on each other. Each object in the pair experiences one of the forces in the pair. The forces in the pair have equal strengths even if the two interacting objects have different masses or speeds. The forces in the pair don't balance each other because they act on two different objects. Mahesh Shenoy video https://cdn.kastatic.org/ka_thumbnails_cache/ed233176-22c8-47e9-a20e-3216d02adf0d_1280_720_base.png Newton's third law Forces result from interactions between objects. Newton's third law states that two interacting objects exert equal and opposite forces on each other. Each object in the pair experiences one of the forces in the pair. The forces in the pair have equal strengths even if the two interacting objects have different masses or speeds. The forces in the pair don't balance each other because they act on two different objects. https://cdn.kastatic.org/ka-youtube-converted/9ViLDdSTrMU.mp4/9ViLDdSTrMU.mp4 398 Forces and Newton's third law https://www.khanacademy.org/science/cambridge-o-level-physics-cie/x0e04e0cb682fb793:forces/x0e04e0cb682fb793:action-and-reaction-force/a/forces-and-newtons-third-law 2026-05-22T02:40:52.34993014Z 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:motion-and-forces/x1baed5db7c1bb50b:forces/e/understand-action-and-reaction-forces 2026-06-30T16:50:53.664877621Z Understand: Forces and Newton's third law Check your understanding of forces and Newton's third law in this set of free, standards-aligned practice questions. Khan Academy exercise https://www.khanacademy.org/science/ms-physics/x1baed5db7c1bb50b:motion-and-forces/x1baed5db7c1bb50b:forces/e/apply-forces-and-newton-s-third-law 2026-06-30T16:50:53.664877621Z Apply: Forces and Newton's third law Apply your knowledge of forces and Newton's third law in this set of free, standards-aligned practice questions. Molly Sauder exercise