https://www.khanacademy.org/science/in-in-class9th-physics-india/in-in-force-laws-of-motion/in-in-newtons-first-law/v/newtons-first-law-intro-forces-causes-motion 2021-04-06T14:32:18Z Newton's first law intro (forces causes motion?) Do forces really cause motion? Let's find out with examples. Mahesh Shenoy video https://cdn.kastatic.org/googleusercontent/Lc89Q7sESKwduREfm_KvYzGTK9rHwLqmG6AjR0djm0su9mqm4BmFRD_BgLvyCD6iwhG6DaJuZswCCgQkcjyrKCFH Newton's first law intro (forces causes motion?) Do forces really cause motion? Let's find out with examples. https://cdn.kastatic.org/ka-youtube-converted/nSOcHFahe2Q.mp4/nSOcHFahe2Q.mp4 633 Newton's Laws of Motion https://www.khanacademy.org/science/in-in-class9th-physics-india/in-in-force-laws-of-motion/in-in-newtons-first-law/v/balanced-unbalanced-forces 2021-04-06T14:32:18Z Balanced & unbalanced forces Lets use real life examples and study balanced and unbalanced forces. Mahesh Shenoy video https://cdn.kastatic.org/googleusercontent/xTvWFpvFRN-V_KvCH9_FQ6r7udCAPRVPebKj8aXLCPMPD8det6BkD7uoh-Q26vzAzjZYKyV04PxriMMLGuscm1c Balanced & unbalanced forces Lets use real life examples and study balanced and unbalanced forces. https://cdn.kastatic.org/ka-youtube-converted/CGdC5eZprW4.mp4/CGdC5eZprW4.mp4 678 Newton's Laws of Motion https://www.khanacademy.org/science/in-in-class9th-physics-india/in-in-force-laws-of-motion/in-in-newtons-first-law/v/newton-s-first-law-of-motion 2023-09-10T17:11:17.624018169Z Newton's first law of motion Newton's First Law of Motion, also known as the Law of Inertia, states that an object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force. This law, originally formulated by Galileo, is fundamental to understanding motion and forces. Sal Khan video https://cdn.kastatic.org/googleusercontent/fmS9hIt1iuTvGIeiQlC-CGjahm0tY7oWSnCxEJtz4bIiz2VWwYKYwJ1GkLJNK8vkSVnIEBva5fjjJ84GF4W-LEe- Newton's first law of motion Newton's First Law of Motion, also known as the Law of Inertia, states that an object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force. This law, originally formulated by Galileo, is fundamental to understanding motion and forces. https://cdn.kastatic.org/ka-youtube-converted/CQYELiTtUs8.mp4/CQYELiTtUs8.mp4 572 Newton's Laws of Motion https://www.khanacademy.org/science/in-in-class11th-physics/in-in-class11th-physics-laws-of-motion/in-in-class-11-newtons-first-law-mass-and-inertia/e/newtons-first-law-exercises-ap1 2026-03-25T13:20:47.939559562Z Net force and acceleration exercise Practice using Newton's first law to make conclusions about an object's acceleration or the forces on the object.  April Russell exercise https://www.khanacademy.org/science/in-in-class9th-physics-india/in-in-force-laws-of-motion/in-in-newtons-second-law-inertia/v/finding-force-newtons-second-law-solved-example 2021-04-06T14:32:18Z Finding force - Newton's second law (Solved example) Let's solve some examples of Newton's second law of motion. Given various details of motion, we will see how to calculate the force on a body (using the second law of motion formula F = ma). Mahesh Shenoy video https://cdn.kastatic.org/googleusercontent/V51jg6ZellfsctgLveVeoTvz9kNz2UHNawAW5ZLgJtASbc9ItnSJCFc9T4Km88tWCF5jaC-va7N7P6zo5TsG6aHeag Finding force - Newton's second law (Solved example) Let's solve some examples of Newton's second law of motion. Given various details of motion, we will see how to calculate the force on a body (using the second law of motion formula F = ma). https://cdn.kastatic.org/ka-youtube-converted/A-0EWBCxikg.mp4/A-0EWBCxikg.mp4 712 Newton's Laws of Motion https://www.khanacademy.org/science/in-in-class9th-physics-india/in-in-force-laws-of-motion/in-in-momentum-and-force/v/newtons-second-law-momentum 2021-04-06T14:32:19Z Newton's second law & momentum The rate of change of momentum = net force. This is another version of Newton's second law. But what does it mean? Let's explore this with some everyday examples. Mahesh Shenoy video https://cdn.kastatic.org/googleusercontent/s7gUtsbWjVZzrkiLtUW5okAxJx4o6jz1ACkpqKlafPVoD9L0jk_KO0YpcJ_V_6uBej1IXCQkB0Id6dRE1GxXvMA Newton's second law & momentum The rate of change of momentum = net force. This is another version of Newton's second law. But what does it mean? Let's explore this with some everyday examples. https://cdn.kastatic.org/ka-youtube-converted/qVrRsPMi4lM.mp4/qVrRsPMi4lM.mp4 748 Newton's Laws of Motion https://www.khanacademy.org/science/in-in-class9th-physics-india/in-in-force-laws-of-motion/in-in-momentum-and-force/v/calculating-momentum-changes-solved-example 2021-04-06T14:32:19Z Calculating momentum changes - Solved example Let's calculate changes in momentum & force in a couple of scenarios. Mahesh Shenoy video https://cdn.kastatic.org/googleusercontent/vR3i9W36G5bXzKw6E_lP3lWLEx5P8Uzw5GXoP1U22a49gbeCMzNTt0NzikYR2ourRsArHx4McdHc3nY_OQg-owF9 Calculating momentum changes - Solved example Let's calculate changes in momentum & force in a couple of scenarios. https://cdn.kastatic.org/ka-youtube-converted/FOVa9YQc4Fs.mp4/FOVa9YQc4Fs.mp4 721 Newton's Laws of Motion https://www.khanacademy.org/science/in-in-class11th-physics/in-in-class11th-physics-laws-of-motion/in-in-class11-newtons-second-law/v/newton-s-second-law-of-motion 2023-04-30T21:01:15.828786566Z Newton's second law of motion Newton's second law of motion states that F = ma, or net force is equal to mass times acceleration. A larger net force acting on an object causes a larger acceleration, and objects with larger mass require more force to accelerate. Both the net force acting on an object and the object's mass determine how the object will accelerate. Sal Khan video https://cdn.kastatic.org/googleusercontent/APQcdQoh57rMTIj4pO6TbuiqvHQANnm89JTjbSFLIR_NtjMRinQepUzzyhOjr03EGiUXKZ9BVyqhV7sjCXSC1zM Newton's second law of motion Newton's second law of motion states that F = ma, or net force is equal to mass times acceleration. A larger net force acting on an object causes a larger acceleration, and objects with larger mass require more force to accelerate. Both the net force acting on an object and the object's mass determine how the object will accelerate. https://cdn.kastatic.org/ka-youtube-converted/ou9YMWlJgkE.mp4/ou9YMWlJgkE.mp4 434 Newton's Laws of Motion https://www.khanacademy.org/science/in-in-class11th-physics/in-in-class11th-physics-laws-of-motion/in-in-class11-newtons-third-law/v/newton-s-third-law-of-motion 2023-04-30T21:01:15.828786566Z Newton's third law of motion Newton's third law states that for every action there is an equal and opposite reaction. The "action" and "reaction" refer to forces; if Object A exerts a force on Object B, then Object B exerts an equal amount of force on Object A in the opposite direction. Examples include pushing an object, stepping on the ground, and rockets. Sal Khan video https://cdn.kastatic.org/googleusercontent/Z6-bO4W7OJb9wSIOyD061O5-5nPNlcTxduwQL99ftRoES7Z8Ae2JbDHZ0y3Eb7BkGvedAzae1Y0PQJyx7OS-r9c Newton's third law of motion Newton's third law states that for every action there is an equal and opposite reaction. The "action" and "reaction" refer to forces; if Object A exerts a force on Object B, then Object B exerts an equal amount of force on Object A in the opposite direction. Examples include pushing an object, stepping on the ground, and rockets. https://cdn.kastatic.org/ka-youtube-converted/By-ggTfeuJU.mp4/By-ggTfeuJU.mp4 480 Newton's Laws of Motion https://www.khanacademy.org/science/in-in-class11th-physics/in-in-class11th-physics-laws-of-motion/in-in-class11-newtons-third-law/e/newton-s-third-law 2026-03-25T13:20:47.939559562Z Identifying equal and opposite forces Practice identifying the correct reaction to an action using Newton's third law.  Sean Boston exercise https://www.khanacademy.org/science/in-in-class11th-physics/in-in-class11th-physics-laws-of-motion/in-in-class11-newtons-third-law/e/newtons-third-law 2026-03-25T13:20:47.939559562Z Newton's third law of motion Conceptual question testing understanding of Newton's Third Law of Motion Sal Khan exercise