https://www.khanacademy.org/science/in-in-class11th-physics/in-in-phy-gravitation/in-in-gravity-newtonian/v/mass-and-weight-clarification 2021-05-19T21:46:38Z Mass and weight clarification Difference between mass and weight Sal Khan video https://cdn.kastatic.org/googleusercontent/lTivq_eKNpyI6e5ypP9czis3Pm3p2cMtDiJmA_98qdqRqN4TnVhpSkeKDIDxDPyE-vZ9bF7ZjW6aE4cFygR04kTu Mass and weight clarification Difference between mass and weight https://cdn.kastatic.org/ka-youtube-converted/IuBoeDihLUc.mp4/IuBoeDihLUc.mp4 641 Gravitation https://www.khanacademy.org/science/in-in-class11th-physics/in-in-phy-gravitation/in-in-gravity-newtonian/v/gravity-for-astronauts-in-orbit 2021-02-07T17:14:01Z Gravity for astronauts in orbit Why do astronauts appear weightless despite being near the Earth? Sal Khan video https://cdn.kastatic.org/googleusercontent/u8N_LHGlTNGaqsQelk_-ZBgnG5ELHlAqu35EMb3UjcDSczZxoJuhBy8gNCra3nqdN-XP4I_863gge_OWHYmz8ho Gravity for astronauts in orbit Why do astronauts appear weightless despite being near the Earth? https://cdn.kastatic.org/ka-youtube-converted/oIZV-ixRTcY.mp4/oIZV-ixRTcY.mp4 432 Gravitation https://www.khanacademy.org/science/in-in-class9th-physics-india/in-in-gravity/in-in-free-fall-acceleration-due-to-gravity/v/would-a-brick-or-feather-fall-faster 2021-02-07T17:14:01Z Would a brick or feather fall faster? What would fall faster on the moon, a brick or a feather? Sal Khan video https://cdn.kastatic.org/googleusercontent/tX9aToUIQOXWBaC-QDOOtq2XlnsUKN6FT_hs0_ZAJ_kVHdTqZhknlguHB4CEuGQZWYLHvNIZ_VjNjdewhBGUp8Lc Would a brick or feather fall faster? What would fall faster on the moon, a brick or a feather? https://cdn.kastatic.org/ka-youtube-converted/36Rym2q4H94.mp4/36Rym2q4H94.mp4 635 Gravitation https://www.khanacademy.org/science/in-in-class11th-physics/in-in-phy-gravitation/in-in-gravity-newtonian/v/introduction-to-newton-s-law-of-gravitation 2022-11-16T04:22:43.7414897Z Introduction to Newton's law of gravitation Gravity is a force of mutual attraction between two objects that both have mass or energy. Newton's universal law of gravitation can be used to approximate the strength of gravitation forces between two objects as a function of the objects' masses and the distance between them. Sal Khan video https://cdn.kastatic.org/googleusercontent/Jq1YaCdf8eAZzugt4HhH70A94gJ9_gpQFtOQzeFkdMGtrpOwpmETlePheotGKqw6R4TCcGZU6okiQgX00TBfuO5u Introduction to Newton's law of gravitation Gravity is a force of mutual attraction between two objects that both have mass or energy. Newton's universal law of gravitation can be used to approximate the strength of gravitation forces between two objects as a function of the objects' masses and the distance between them. https://cdn.kastatic.org/ka-youtube-converted/391txUI76gM.mp4/391txUI76gM.mp4 517 Gravitation https://www.khanacademy.org/science/in-in-class11th-physics/in-in-phy-gravitation/in-in-gravity-newtonian/v/gravitation-part-2 2021-02-07T17:14:01Z Gravitation (part 2) A little bit more on gravity Sal Khan video https://cdn.kastatic.org/googleusercontent/veF2wAaRiKPEO9AEUsrS6Y_l0WKo67KuDltlqdZ3x1OrCuUQBJ4CWzTswRf7gCYYHI3lWV3XVXBB_CnzK5z4Ar4 Gravitation (part 2) A little bit more on gravity https://cdn.kastatic.org/ka-youtube-converted/8i0j3j16yFk.mp4/8i0j3j16yFk.mp4 496 Gravitation https://www.khanacademy.org/science/revision-term-2-jnv-physics-grade-11/x077d246dcd1fe558:week-1/x077d246dcd1fe558:gravitation/e/kepler-laws 2025-05-26T13:40:29.985667705Z Kepler Laws kepler-laws Chandan exercise https://www.khanacademy.org/science/in-in-class11th-physics/in-in-phy-gravitation/in-in-gravity-newtonian/v/acceleration-due-to-gravity-at-the-space-station 2021-02-07T17:14:00Z Acceleration due to gravity at the space station What is the acceleration due to gravity at the space station Sal Khan video https://cdn.kastatic.org/googleusercontent/urfL3eko3zBowuG2q-fg87g3HTu1bmDiG1DUg2diIPk9QQMdEjm97MHehumVQEtrMry6G_wZ71QZF_3AdQDsEv2n Acceleration due to gravity at the space station What is the acceleration due to gravity at the space station https://cdn.kastatic.org/ka-youtube-converted/R5CRZONOHCU.mp4/R5CRZONOHCU.mp4 613 Gravitation https://www.khanacademy.org/science/in-in-class11th-physics/in-in-phy-gravitation/in-in-gravity-newtonian/v/space-station-speed-in-orbit 2021-02-07T17:14:00Z Space station speed in orbit Speed necessary for the space station to stay in orbit Sal Khan video https://cdn.kastatic.org/googleusercontent/JjQv6O9rZr0OYynYvTMZzWgPuQf3Crf0UDqMXP--YZRci120fqf4MYLKnU8gfTfPqXVBDp1OFocFfl4LBUsyb-w Space station speed in orbit Speed necessary for the space station to stay in orbit https://cdn.kastatic.org/ka-youtube-converted/9BNkmfHYYYI.mp4/9BNkmfHYYYI.mp4 396 Gravitation https://www.khanacademy.org/science/in-in-class11th-physics/in-in-phy-gravitation/in-in-gravity-newtonian/v/viewing-g-as-the-value-of-earth-s-gravitational-field-near-the-surface 2024-10-31T14:33:34.523193904Z The concept of gravitational field There are two ways to interpret the constant g for Earth. The first interpretation is as the magnitude of the acceleration due to gravity of an object in free fall near Earth's surface. The second interpretation is as the magnitude of the gravitational field at Earth's surface, which can be used to calculate the force of gravity on an object. The magnitude of the gravitational field created by a body at a point in space is equal to the ratio of the gravitational force exerted by the body on an object located at that point in the body's field, divided by the mass of the object. In other words, the gravitational field is the force per unit mass that the body will exert on an object. Sal Khan video https://cdn.kastatic.org/googleusercontent/6AzS1wICHIcbMCTQAzWv545ysTVZsa9H0MqQWrExSGKlnKiXVj89y3HqcRo7LmlD2akZiBMdIBXQg6hPKEi2OmnK The concept of gravitational field There are two ways to interpret the constant g for Earth. The first interpretation is as the magnitude of the acceleration due to gravity of an object in free fall near Earth's surface. The second interpretation is as the magnitude of the gravitational field at Earth's surface, which can be used to calculate the force of gravity on an object. The magnitude of the gravitational field created by a body at a point in space is equal to the ratio of the gravitational force exerted by the body on an object located at that point in the body's field, divided by the mass of the object. In other words, the gravitational field is the force per unit mass that the body will exert on an object. https://cdn.kastatic.org/ka-youtube-converted/1E3Z_R5AHdg.mp4/1E3Z_R5AHdg.mp4 451 Gravitation https://www.khanacademy.org/science/in-in-class11th-physics/in-in-phy-gravitation/in-in-gravity-newtonian/e/newton-s-law-of-gravity-ap1 2026-03-12T00:50:35.110583553Z Gravitational field strength Predict how gravitational field strength changes with radius and mass. April Russell exercise https://www.khanacademy.org/science/in-in-class11th-physics/in-in-phy-gravitation/in-in-gravity-newtonian/e/gravity-and-orbits-ap1 2026-04-07T23:55:07.30621384Z Gravity and orbits Gravity and orbits April Russell exercise https://www.khanacademy.org/science/in-in-class11th-physics/in-in-phy-gravitation/in-in-gravitational-potential-energy-at-large-distances/e/radius-of-gyration 2025-05-22T20:00:19.681517034Z Radius of Gyration Radius of Gyration Chandan Ganotra exercise https://www.khanacademy.org/science/in-in-class11th-physics/in-in-phy-gravitation/in-in-gravitational-potential-energy-at-large-distances/v/gravitational-potential-energy-at-large-distances 2022-09-11T00:33:55.311722934Z Gravitational potential energy at large distances Learn how to calculate gravitational potential energy when we can no longer assume the gravitational field is uniform. video https://cdn.kastatic.org/googleusercontent/mzznMBF99vqy1y1mit14w9QIQrQ1zosidQKNPrODPfmRHX2_oFqaYovpjphyhxmKTEPUWiiwAyEmVyb2U4P3rHE0yA Gravitational potential energy at large distances Learn how to calculate gravitational potential energy when we can no longer assume the gravitational field is uniform. https://cdn.kastatic.org/ka-youtube-converted/9Pp_LtKgTQg.mp4/9Pp_LtKgTQg.mp4 304 Gravitation https://www.khanacademy.org/science/revision-term-2-jnv-physics-grade-11/x077d246dcd1fe558:week-1/x077d246dcd1fe558:gravitation/e/gravitational-potential 2025-03-29T06:26:54.41565471Z Gravitational potential Gravitational potential Chandan Ganotra exercise https://www.khanacademy.org/science/in-in-class-11-physics-cbse-hindi/in-in-11-gravitation-hindi/gravitational-potential-energy-at-large-distances-hindi/e/gravitational-potential-energy-at-large-distances-quantitative-ap1 2026-04-07T23:17:37.123726494Z Calculating gravitational potential energy of a system Practice calculating the gravitational potential energy for a system of two masses.  April Russell exercise https://www.khanacademy.org/science/in-in-class-11-physics-cbse-hindi/in-in-11-gravitation-hindi/gravitational-potential-energy-at-large-distances-hindi/e/gravitational-potential-energy-at-long-distances-qualitative-ap1 2026-04-08T00:54:09.631945657Z Gravitational potential energy and conservation of angular momentum Predict changes in gravitational potential energy and angular momentum for a system of two masses.  April Russell exercise