https://www.khanacademy.org/science/cambridge-o-level-physics-cie/x0e04e0cb682fb793:space-science/x0e04e0cb682fb793:untitled-899/v/introduction-to-gravity 2023-04-30T21:01:15.828786566Z Introduction to gravity Newton's Law of Universal Gravitation describes the strength of gravitational attraction between two objects. The gravitational force is equal to the mass of object 1 times the mass of object 2, divided by the distance between the objects squared, all times the gravitational constant (G). G is small, so the force is only noticeable if one or both objects are very massive. Sal Khan video https://cdn.kastatic.org/googleusercontent/srnSzuP3zeDJn0bLL0RLU6YOMhZCPgv7nIJBagq80fxiCqd6gmvfB7ee-wsxH4m3L3cF9mXXnYX6fjIefUlZ-Vdr4A Introduction to gravity Newton's Law of Universal Gravitation describes the strength of gravitational attraction between two objects. The gravitational force is equal to the mass of object 1 times the mass of object 2, divided by the distance between the objects squared, all times the gravitational constant (G). G is small, so the force is only noticeable if one or both objects are very massive. https://cdn.kastatic.org/ka-youtube-converted/Xcel427Ezl0.mp4/Xcel427Ezl0.mp4 943 Gravitational Field https://www.khanacademy.org/science/cambridge-o-level-physics-cie/x0e04e0cb682fb793:space-science/x0e04e0cb682fb793:untitled-899/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 Gravitational Field https://www.khanacademy.org/science/cambridge-o-level-physics-cie/x0e04e0cb682fb793:space-science/x0e04e0cb682fb793:untitled-899/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 Gravitational Field https://www.khanacademy.org/science/cambridge-o-level-physics-cie/x0e04e0cb682fb793:space-science/x0e04e0cb682fb793:untitled-899/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/cambridge-o-level-physics-cie/x0e04e0cb682fb793:kinematics/x0e04e0cb682fb793:free-fall-acceleration/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 Gravitational Field