https://www.khanacademy.org/science/physics/forces-newtons-laws/newtons-laws-of-motion/v/balanced-and-unbalanced-forces 2024-01-16T04:11:35.384208864Z Balanced and unbalanced forces When forces in a particular dimension cancel each other out, they're balanced and result in zero net force. When forces in a particular dimension do not cancel each other out, they're unbalanced and result a nonzero net force. Explore balanced and unbalanced forces through five different scenarios involving a rock and various forces acting on it. Sal Khan video https://cdn.kastatic.org/googleusercontent/LKDY3C-4WFq-cacjqiG2MkgbIId1gEwcyHvTCgoYWUDPZf7sCOJcm_TQCqRY_5MGQYYZlm3ghv_6hChW92cCYH74 Balanced and unbalanced forces When forces in a particular dimension cancel each other out, they're balanced and result in zero net force. When forces in a particular dimension do not cancel each other out, they're unbalanced and result a nonzero net force. Explore balanced and unbalanced forces through five different scenarios involving a rock and various forces acting on it. https://cdn.kastatic.org/ka-youtube-converted/oNgo9bbDi7Q.mp4/oNgo9bbDi7Q.mp4 491 Force and Laws of Motion https://www.khanacademy.org/science/mh-grade-8-science/x0f256b8de9c7cf34:force-and-pressure/x0f256b8de9c7cf34:force/e/balanced-and-unbalanced-forces 2026-04-07T23:55:07.30621384Z Balanced and unbalanced forces Let's solve some questions! vibhor exercise 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 and 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/bridge-course-class-11th-physics/x4c0d503cda725c32:laws-of-motion/x4c0d503cda725c32:newton-s-first-law-of-motion/v/inertia-mass 2024-01-16T04:11:35.384208864Z Inertia & mass Let's explore the ideas of inertia & mass Mahesh Shenoy video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Inertia & mass Let's explore the ideas of inertia & mass https://cdn.kastatic.org/ka-youtube-converted/nNbwr2IDLnk.mp4/nNbwr2IDLnk.mp4 418 Force and Laws of Motion https://www.khanacademy.org/science/bridge-course-class-11th-physics/x4c0d503cda725c32:laws-of-motion/x4c0d503cda725c32:newton-s-first-law-of-motion/e/inertia-and-mass 2026-04-07T22:23:57.656416987Z Inertia and mass Let's solve some questions vibhor 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 and 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/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 Force and 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/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/bridge-course-class-11th-physics/x4c0d503cda725c32:laws-of-motion/x4c0d503cda725c32:newton-s-second-law-of-motion/e/identifying-action-reaction-pairs 2025-04-09T10:12:02.040424533Z Identifying action-reaction pairs Let's solve some questions! vibhor exercise 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 Force and 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-solved-example 2024-05-06T20:53:58.873997715Z Conservation of momentum calculations Conservation of momentum can be used to predict the motion of objects after a collision. Let's try two practice problems together. Mahesh Shenoy video https://cdn.kastatic.org/googleusercontent/5vsn4PWnouUBb_EF-DjnUtqBkSpqoBgPFaqF_bOoXAeKiOjIXv4qHRn_SQuj0uZDsGWlKxILsAMwQQiPk62cd0o Conservation of momentum calculations Conservation of momentum can be used to predict the motion of objects after a collision. Let's try two practice problems together. https://cdn.kastatic.org/ka-youtube-converted/VwnSR8X8LrA.mp4/VwnSR8X8LrA.mp4 663 Force and 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