# Understanding Gravitation

by Ron Kurtus (updated 16 March 2023)

Gravitation is the force of attraction between objects of matter—usually on a large scale. It is different than Gravity, which is an approximation of Gravitation and is the force that pulls objects toward the Earth.

Gravitation is a subject in Physics, which in turn is a branch of Physical Science. There is a great need for people who understand scientific principles and know how to think logically. Your knowledge and skills in these areas can help you excel in school, advance your career or improve your business.

The purpose of these free online lessons is to give you a start at improving your scientific knowledge of Gravitation that will help you become a champion in the field.

## Overview

Overview of Gravity and Gravitation

Overview of Gravitation

Direction Convention for Gravitational Motion

## Theories

Theories of Gravitation

Law of Universal Gravitation

Universal Gravitation Equation

General Relativity Theory of Gravitation

Quantum Theory of Gravitation

Effect of Dark Matter and Dark Energy on Gravitation

Gravitation as a Fundamental Force

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## Principles

Equivalence Principles of Gravitation

Similarity Between Gravitation and Electrostatic Forces

Gravitational Speed

Gravitational Potential Energy

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## Gravitation applications

Gravitational Force Between Two Objects

Attraction Between Boy and Girl

Cavendish Experiment to Measure Gravitational Constant

Cavendish Experiment Derivation

Influence of Gravitation in the Universe

Gravitation Causes Tides on Earth

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### Center of Mass

Overview of Gravitation and Center of Mass

Center of Mass Definitions

Center of Mass Location and Motion

Relative Motion and Center of Mass

Center of Mass Motion Components

Center of Mass and Radial Gravitational Motion

Center of Mass and Tangential Gravitational Motion

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### Orbital motion

Derivation of Circular Orbits Around Center of Mass

Orbital Motion Relative to Other Object

Circular Planetary Orbits

Length of Year for Planets in Gravitational Orbit

Effect of Velocity on Orbital Motion

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### Escape velocity

Overview of Gravitational Escape Velocity

Derivation of Gravitational Escape Velocity Equation

Gravitational Escape Velocity with Saturn V Rocket

Effect of Sun on Escape Velocity from Earth

Gravitational Escape Velocity from a Black Hole

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Gravity

## Resources

Gravitation Resources

Gravity Resources

Physics Resources

Astronomy Resources

Experiments and Science Fair Projects

Biographies

## Survey results

See results of survey questions

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