Motion, forces, and energy | Physics | Khan Academy - Newton's first law | Physics | Khan Academy

Courses on Khan Academy are always 100% free. Start practicing—and saving your progress—now! https://www.khanacademy.org/science/highschool-physics/x6679aa2c65c01e53:motion-and-forces/x6679aa2c65c01e53:newtons-first-and-second-laws/v/newtons_first_law Want to explore more? Check out the full motion, forces, & momentum playlist here: https://www.youtube.com/playlist?list=PLSQl0a2vh4HCiFE95STYVxTZ6Ep402vfa Newton's first law states than an object at rest remains at rest, and an object in motion remains in motion with constant velocity, until acted on by an unbalanced force. The tendency of objects to maintain their state of motion is called inertia. On Earth, moving objects commonly come to rest without continued application of a force due to the unbalanced forces of friction and air resistance. Sections: 00:00 - Intro 00:26 - What keeps objects at rest? 02:16 - Is rest the natural state of objects? 04:06 - What keeps objects in motion? 06:12 - Newton's first law of motion and inertia 07:00 - Why do we fall when the bus suddenly accelerates? 08:28 - Newton's first law can seem nonintuitive ------------------ 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