https://www.khanacademy.org/science/up-sw-class-9-science-bridge-course/x2164f6ec11d6a504:week-4/x2164f6ec11d6a504:untitled-130/v/gravitational-forces-ms 2024-01-04T21:41:56.674101033Z Gravitational forces Gravity is more than just things falling down. It's an attractive force that exists between any two objects with mass. Every object with mass, like Earth or a lamp, has a gravitational pull. The strength of this pull depends on the mass of the objects and the distance between them. Even the moon feels Earth's gravity, which is why it orbits us. Khan Academy video https://cdn.kastatic.org/ka_thumbnails_cache/ea4aa5db-9a82-421a-be91-0776a2a66cc3_1280_720_base.png Gravitational forces Gravity is more than just things falling down. It's an attractive force that exists between any two objects with mass. Every object with mass, like Earth or a lamp, has a gravitational pull. The strength of this pull depends on the mass of the objects and the distance between them. Even the moon feels Earth's gravity, which is why it orbits us. https://cdn.kastatic.org/ka-youtube-converted/atogJ2qw9Ko.mp4/atogJ2qw9Ko.mp4 220 Tides https://www.khanacademy.org/science/cambridge-o-level-physics-cie/x0e04e0cb682fb793:space-science/x0e04e0cb682fb793:the-earth/v/phases-of-the-moon 2022-09-02T07:28:17.303436145Z Phases of the moon A moon phase is the shape of moon's sunlit portion as seen from Earth. There are a total of eight moon phases: new, waxing crescent, first quarter, waxing gibbous, full, waning gibbous, third quarter, and waning crescent. These phases repeat every 29.5 days. Khan Academy video https://cdn.kastatic.org/ka_thumbnails_cache/b33175fe-10b7-4f4f-91da-d8c1d61bb849_1280_720_base.png Phases of the moon A moon phase is the shape of moon's sunlit portion as seen from Earth. There are a total of eight moon phases: new, waxing crescent, first quarter, waxing gibbous, full, waning gibbous, third quarter, and waning crescent. These phases repeat every 29.5 days. https://cdn.kastatic.org/ka-youtube-converted/f592IgRzq2E.mp4/f592IgRzq2E.mp4 254 Tides https://www.khanacademy.org/science/grade-6-science-snc-aligned/x19bc096754f0b9af:energy/x19bc096754f0b9af:non-renewable-and-renewable-energy-resources/v/neverendingsupply 2020-06-23T07:22:42Z Never-ending supply Renewable energy sources might just be the answer to a sustainable future. What makes an energy source renewable, and how can we use these sources to power our societies well into the future?   NOVA video https://cdn.kastatic.org/googleusercontent/JP0G3kt2QGYlWwKFsaaKMhJy9kXSAESiXhf82XxWN9vi_ne35mnMDhwK393kwlBUoeHed9lUDjgdv8hjrBRqDvuf Never-ending supply Renewable energy sources might just be the answer to a sustainable future. What makes an energy source renewable, and how can we use these sources to power our societies well into the future?   https://cdn.kastatic.org/ka-youtube-converted/_osI4x5XOzA.mp4/_osI4x5XOzA.mp4 165 Tides https://www.khanacademy.org/science/grade-6-science-snc-aligned/x19bc096754f0b9af:energy/x19bc096754f0b9af:non-renewable-and-renewable-energy-resources/e/never-ending-supply-quiz 2021-06-05T01:51:05Z Never-ending supply quiz Try this quiz about renewable energy sources. NOVA exercise