Reference frames | Middle school physics | Khan Academy

Courses on Khan Academy are always 100% free. Start practicing—and saving your progress—now: https://www.khanacademy.org/science/ms-physics Want to explore more? Check out the full middle school physics playlist here: https://www.youtube.com/playlist?list=PLSQl0a2vh4HC-daPugvP8kL_zuE3u_3Zr At first, an object at rest and an object moving at constant velocity may seem to be in very different states of motion. But in fact, they're two different views of the same thing. This becomes clear if we consider the perspectives from different reference frames. Whether an object is at rest or in motion depends on the choice of reference frame. No one reference frame is more valid than another. Sections: 00:00 - Is the ground moving? 03:24 - Motion is relative 04:54 - Summary ------------------ 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?utm_source=youtube&utm_medium=desc Volunteer here: https://www.khanacademy.org/contribute?utm_source=youtube&utm_medium=desc