https://www.khanacademy.org/science/ap-college-physics-1/xf557a762645cccc5:force-and-translational-dynamics/xf557a762645cccc5:circular-motion/a/circular-orbit 2026-02-12T14:51:00.389031159Z Circular orbits Learn how to describe the motion of objects following circular orbits at constant speed. article https://www.khanacademy.org/science/highschool-physics/x6679aa2c65c01e53:gravitation/x6679aa2c65c01e53:newtons-law-of-gravitation/v/newtons_law_of_gravitation 2024-07-01T11:54:52.194339821Z Newton's law of gravitation Newton's law of gravitation mathematically describes the gravitational force two masses exert on each other. The force is equal to the gravitational constant, multiplied by the two masses, divided by the distance between their centers squared. It is an inverse square law. For an object near Earth's surface, the equation simplifies to F = mg, where g = 9.81 m/s^2. Mahesh Shenoy video https://cdn.kastatic.org/ka_thumbnails_cache/38e4ec99-ada1-48a1-bd3d-97e84cfb2b85_1280_720_base.png Newton's law of gravitation Newton's law of gravitation mathematically describes the gravitational force two masses exert on each other. The force is equal to the gravitational constant, multiplied by the two masses, divided by the distance between their centers squared. It is an inverse square law. For an object near Earth's surface, the equation simplifies to F = mg, where g = 9.81 m/s^2. https://cdn.kastatic.org/ka-youtube-converted/PIpnGilqefE.mp4/PIpnGilqefE.mp4 785 Applying Newton’s law of gravitation https://www.khanacademy.org/science/in-in-class11th-physics/in-in-phy-gravitation/in-in-gravity-newtonian/a/newtons-law-of-gravitation-ap1 2021-04-29T07:52:59Z Newton's law of gravitation review Review the key concepts, equations, and skills for Newton's law of gravity, including how to find the gravitational field strength. article https://www.khanacademy.org/science/highschool-physics/x6679aa2c65c01e53:gravitation/x6679aa2c65c01e53:newtons-law-of-gravitation/e/apply-newton-s-law-of-gravitation 2026-02-27T12:30:36.531197313Z Apply: Newton's law of gravitation Apply your knowledge of Newton's law of gravitation in this set of free practice questions. Emily Cizmas exercise https://www.khanacademy.org/science/highschool-physics/x6679aa2c65c01e53:gravitation/x6679aa2c65c01e53:newtons-law-of-gravitation/e/understand-newton-s-law-of-gravitation 2025-05-15T17:42:17.534861452Z Understand: Newton's law of gravitation Check your understanding of Newton's law of gravitation in this set of free practice questions. Emily Cizmas exercise 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 Applying Newton’s law of 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 Applying Newton’s law of gravitation