https://www.khanacademy.org/science/bmc-grade-9-science/x345505a97fc4a662:laws-of-motion/x345505a97fc4a662:newton-s-laws-of-motion/v/newton-s-first-law-of-motion-in 2024-01-16T04:11:35.384208864Z Newton's first law of motion Let's explore Newton's first law of motion Mahesh Shenoy video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Newton's first law of motion Let's explore Newton's first law of motion https://cdn.kastatic.org/ka-youtube-converted/iZz7jaEypjY.mp4/iZz7jaEypjY.mp4 402 Force & 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-class11th-physics/in-in-class11th-physics-laws-of-motion/in-in-class-11-newtons-first-law-mass-and-inertia/e/newton-s-first-law-exercise 2022-11-27T23:01:15.143242814Z Analyzing motion using Newton's laws Let's solve some problems which will help us clear some common misconceptions regarding Newton's first law and its applications. Aakash Bagga 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 Force & Laws of motion https://www.khanacademy.org/science/ap-college-physics-1/xf557a762645cccc5:force-and-translational-dynamics/xf557a762645cccc5:forces-and-acceleration/e/newton-s-second-law 2026-04-07T22:59:30.107127435Z Newton's second law Practice applying Newton's second law to symbolically solve for mass, acceleration, and force magnitude.  Sean Boston exercise https://www.khanacademy.org/science/revision-term-1-ka-science-grade-9/x07cce91f26fedd3c:week-3/x07cce91f26fedd3c:force-laws-of-motion/v/newtons-third-law-of-motion 2025-05-29T08:44:44.739717086Z 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. Dubverse video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw 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/pPhHSF0Teyg.mp4/pPhHSF0Teyg.mp4 480 Force & 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 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 Force & Laws of motion https://www.khanacademy.org/science/in-in-class11th-physics/in-in-class11th-physics-laws-of-motion/in-in-introduction-to-linear-momentum-and-impulse/e/introduction-to-linear-momentum-exercises-ap1 2025-02-17T09:04:27.796626334Z Calculating linear momentum and change in momentum Practice finding quantities related to linear momentum  and the change in momentum from word problems.  April Russell exercise https://www.khanacademy.org/science/in-in-class9th-physics-india/in-in-force-laws-of-motion/in-in-conservation-of-momentum/v/momentum-conservation-derivation 2021-04-06T14:32:18Z Momentum conservation derivation Let's derive the conservation of momentum mathematically (Mathematical Proof) from Newton's third law. Mahesh Shenoy video https://cdn.kastatic.org/googleusercontent/4SBVJjazDlqEHNn0Vlsuk8FdDkfwrL5bNF18dUZ2txPNjoJJ-P4jj8dTBaPTYHTs7OTbnHX95iprn2dLW7PNgmLV Momentum conservation derivation Let's derive the conservation of momentum mathematically (Mathematical Proof) from Newton's third law. https://cdn.kastatic.org/ka-youtube-converted/NunII3iPsR4.mp4/NunII3iPsR4.mp4 653 Force & Laws of motion https://www.khanacademy.org/science/ap-college-physics-1/xf557a762645cccc5:linear-momentum/xf557a762645cccc5:untitled-303/e/conservation-of-momentum-ap-physics-1 2026-02-06T04:22:50.396963225Z Conservation of momentum calculations Apply your knowledge of conservation of momentum in this set of free practice questions. Sean Boston exercise