# Gravity and Gravitation

Gravity and Gravitation are subjects in Physics, which in turn is a branch of Physical Science. Gravity is the force that pulls objects toward the Earth. It is an approximation of Gravitation, which is the force that attracts matter and all objects toward each other.

There is a great need for people who understand these 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 Gravity and Gravitation that will help you become a champion in the field. If you have any questions, send me an email.

## Gravity and Gravitation Contents

## Gravity and Gravitation

## Gravity topics

### Basics

Convention for Direction in Gravity Equations

Equivalence Principle of Gravity

### Derivations of equations

Overview of Gravity Equation Derivations

Derivation of Velocity-Time Gravity Equations

Derivation of Displacement-Time Gravity Equations

### Falling objects

Overview of Gravity Equations for Falling Objects

Velocity Equations for Falling Objects

Displacement Equations for Falling Objects

### Projected downward

Overview of Gravity Equations for Objects Projected Downward

Velocity Equations for Objects Projected Downward

Displacement Equations for Objects Projected Downward

### Projected upward

Overview of Gravity Equations for Objects Projected Upward

Velocity Equations for Objects Projected Upward

Displacement Equations for Objects Projected Upward

### Gravity and energy

Overview of Energy from Gravity

Energy of Objects Projected Downward

### Gravity and work

Work by Gravity Against Inertia and Air

### Gravity applications

Effect of Gravity on Sideways Motion

## Gravitation topics

### Theories

Universal Gravitation Equation

General Relativity Theory of Gravitation

Effect of Dark Matter and Dark Energy on Gravitation

### Principles

Equivalence Principles of Gravitation

Similarity Between Gravitation and Electrostatic Forces

### Gravitation applications

Gravitational Force Between Two Objects

Cavendish Experiment to Measure Gravitational Constant

Influence of Gravitation in the Universe

### Center of Mass

Overview of Gravitation and Center of Mass

Center of Mass Location and Motion

Relative Motion and Center of Mass

Center of Mass Motion Components

Center of Mass and Radial Gravitational Motion

### Orbital motion

Derivation of Circular Orbits Around Center of Mass

Orbital Motion Relative to Other Object

Length of Year for Planets in Gravitational Orbit

### Escape velocity

Overview of Gravitational Escape Velocity

Gravitational Escape Velocity Derivation

Gravitational Escape Velocity with Saturn V Rocket

## Resources

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