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### Gravity Overview

All objects with mass attract and are attracted by all other objects with mass because of a force called gravity. The strength of gravity is proportional to the mass of the object. We are pulled to the Earth by it's gravitational forces but we also pull the earth towards us. Because we are much less massive than than the Earth, our gravitational pull is not strong enough to have any effect on it. Gravity pulls us towards Earth such that we accelerate at 9.8 m/s^{2}.

A walkthrough of the basics of A-Level gravitation physics.
### Center of Mass

The center of mass is the position of the average of all the mass of an object or a system.

Finding an object's center of mass or center of gravity

An educational video about center of mass.

More Lessons for High School Physics

Math Worksheets

A series of free Online High School Physics Video Lessons.

In this lesson, we will learn

- about gravity
- center of mass
- toppling and stability

A walkthrough of the basics of A-Level gravitation physics.

Finding an object's center of mass or center of gravity

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