DefinePK

Description

Courses on Khan Academy are always 100% free. Start practicing—and saving your progress—now! https://www.khanacademy.org/science/ap-college-physics-1

Newton’s law of universal gravitation describes the gravitational forces two objects exert on each other. The gravitational force is always attractive and is exerted along the line connecting the two objects’ centers of mass. The gravitational field created by an object at a point in space is the gravitational force exerted on another test object at that location, divided by the mass of the test object. If the gravitational force is the only force exerted on an object, the observed acceleration of the object (in m/s^2) is numerically equal to the magnitude of the gravitational field strength (in N/kg) at that location.

Sections:
00:00 - Intro
00:10 - Newton's law of universal gravitation
02:18 - Acceleration due to gravity
04:55 - Gravitational vector field model
08:03 - Gravitational field vs gravitational acceleration
09:08 - Gravitational field line model
10:46 - Intuition behind the inverse square law

------------------

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