Newton's law of gravitation | Physics | Khan Academy

Courses on Khan Academy are always 100% free. Start practicing—and saving your progress—now! https://www.khanacademy.org/science/h... 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. Sections: 00:00 - Intro 00:16 - The gravitational force (Fg) 01:27 - How mass affects Fg 01:56 - How distance affects Fg 02:39 - Newton's law of universal gravitation 04:09 - Gravitational constant (G) 05:52 - Inverse square law 07:43 - Force of gravity close to earth 10:38 - Acceleration due to gravity (g) 11:49 - How did we figure out the mass of Earth? ------------------ Khan Academy is a nonprofit organization with the mission of providing a free, world-class education for anyone, anywhere. Khan Academy has been translated into dozens of languages, and 15 million people around the globe learn on Khan Academy every month. As a 501(c)(3) nonprofit organization, we would love your help! Donate here: https://www.khanacademy.org/donate?ut... Volunteer here: https://www.khanacademy.org/contribut...