https://www.khanacademy.org/science/cambridge-o-level-physics-cie/x0e04e0cb682fb793:forces/x0e04e0cb682fb793:newton-s-nd-law-of-motion/v/newton-s-first-law-of-motion-concepts 2023-04-30T21:01:15.828786566Z Applying Newton's first law of motion Newton's first law quiz 1. If the net force on an object is zero, its velocity won't change. (True) 2. An unbalanced force on an object will always impact the object's speed. (False) 3. Moving objects come to rest in everyday life because of unbalanced forces. (True) 4. An unbalanced force on an object will always change the object's direction. (False) Sal Khan video https://cdn.kastatic.org/googleusercontent/LHxurZ01Zp0KtWeR2uYhrqzFkmPLZJXtrqcPtasuobaziWs2gdy2piHfNwoAtkZ6HvzlYQ7HljL6nYkLiJUea7DT Applying Newton's first law of motion Newton's first law quiz 1. If the net force on an object is zero, its velocity won't change. (True) 2. An unbalanced force on an object will always impact the object's speed. (False) 3. Moving objects come to rest in everyday life because of unbalanced forces. (True) 4. An unbalanced force on an object will always change the object's direction. (False) https://cdn.kastatic.org/ka-youtube-converted/D1NubiWCpQg.mp4/D1NubiWCpQg.mp4 434 Newton's 2nd Law of Motion https://www.khanacademy.org/science/cambridge-o-level-physics-cie/x0e04e0cb682fb793:forces/x0e04e0cb682fb793:newton-s-nd-law-of-motion/v/newtons_second_law 2024-06-30T23:53:54.560474813Z Newton's second law Newton's second law states than an object's acceleration is equal to the net force acting on the object, divided by its mass. Newton's first law is a special case of the second law when the net force on an object is zero. Newton's second law applies to macroscopic objects moving much slower than the speed of light. Mahesh Shenoy video https://cdn.kastatic.org/ka_thumbnails_cache/623858f6-5003-4ee9-96e9-197f9c6eb168_1280_720_base.png Newton's second law Newton's second law states than an object's acceleration is equal to the net force acting on the object, divided by its mass. Newton's first law is a special case of the second law when the net force on an object is zero. Newton's second law applies to macroscopic objects moving much slower than the speed of light. https://cdn.kastatic.org/ka-youtube-converted/EwGGh1dC3kQ.mp4/EwGGh1dC3kQ.mp4 684 Newton's 2nd Law of Motion https://www.khanacademy.org/science/cambridge-o-level-physics-cie/x0e04e0cb682fb793:forces/x0e04e0cb682fb793:newton-s-nd-law-of-motion/v/newtons-second-law 2025-07-01T10:10:08.145512912Z Newton's second law If the forces on an object are unbalanced (the net force is not zero), the object will accelerate. How much the object accelerates depends on two factors: the strength of the net force, and the mass of the object. We can conduct an experiment to determine how acceleration depends on these two factors separately. If we keep the object's mass constant and increase the net force, we find that the object accelerates more. If we keep the net force constant and increase the object's mass, we find that the object accelerates less. Mahesh Shenoy video https://cdn.kastatic.org/ka_thumbnails_cache/6addfd09-2e8d-4bf9-94de-e47adc97ad78_1280_720_base.png Newton's second law If the forces on an object are unbalanced (the net force is not zero), the object will accelerate. How much the object accelerates depends on two factors: the strength of the net force, and the mass of the object. We can conduct an experiment to determine how acceleration depends on these two factors separately. If we keep the object's mass constant and increase the net force, we find that the object accelerates more. If we keep the net force constant and increase the object's mass, we find that the object accelerates less. https://cdn.kastatic.org/ka-youtube-converted/l_rw0RfS5x4.mp4/l_rw0RfS5x4.mp4 557 Newton's 2nd Law of Motion https://www.khanacademy.org/science/cambridge-o-level-physics-cie/x0e04e0cb682fb793:forces/x0e04e0cb682fb793:newton-s-nd-law-of-motion/a/what-is-newtons-second-law 2026-05-01T14:10:52.97313295Z Learn and try: Newton's first and second laws Learn how to predict the translational motion of objects using Newton's first and second laws. article https://www.khanacademy.org/science/cambridge-o-level-physics-cie/x0e04e0cb682fb793:forces/x0e04e0cb682fb793:newton-s-nd-law-of-motion/e/understand-newton-s-second-law 2024-07-07T08:19:37.211625487Z Understand: Newton's first and second laws Check your understanding of Newton's second law in this set of free practice questions. Emily Cizmas exercise https://www.khanacademy.org/science/cambridge-o-level-physics-cie/x0e04e0cb682fb793:forces/x0e04e0cb682fb793:newton-s-nd-law-of-motion/e/apply-newton-s-second-law 2026-01-23T20:00:36.154127952Z Apply: Newton's first and second laws Apply your knowledge of Newton's second law in this set of free practice questions. Emily Cizmas exercise