# 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.

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## Gravity and Gravitation

Overview of Gravity and Gravitation

## Gravity topics

Overview of Force of Gravity

### Basics

Vectors in Gravity Equations

Convention for Direction in Gravity Equations

Gravity Constant Factors

Equivalence Principle of Gravity

Mass, Weight and Gravity

Horizontal Motion Unaffected by Gravity

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### Derivations of equations

Overview of Gravity Equation Derivations

Derivation of Velocity-Time Gravity Equations

Derivation of Displacement-Time Gravity Equations

Derivation of Displacement-Velocity Gravity Equations

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### Falling objects

Overview of Gravity Equations for Falling Objects

Velocity Equations for Falling Objects

Displacement Equations for Falling Objects

Time Equations for Falling Objects

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### Projected downward

Overview of Gravity Equations for Objects Projected Downward

Velocity Equations for Objects Projected Downward

Displacement Equations for Objects Projected Downward

Time Equations for Objects Projected Downward

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### Projected upward

Overview of Gravity Equations for Objects Projected Upward

Velocity Equations for Objects Projected Upward

Displacement Equations for Objects Projected Upward

Time Equations for Objects Projected Upward

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### Gravity and energy

Overview of Energy from Gravity

Energy of Falling Objects

Energy of Objects Projected Downward

Energy of Objects Projected Upward

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### Gravity and work

Work by Gravity Against Inertia and Air

Work Against Gravity to Lift an Object

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### Gravity applications

Effect of Gravity on Sideways Motion

Effect of Gravity on an Artillery Projectile

Gravity and Newton's Cannon

Escape Velocity from Gravity

Artificial Gravity

Center of Gravity

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## Gravitation topics

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

Cavendish Experiment to Measure Gravitational Constant

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

Gravitational Escape Velocity Derivation

Gravitational Escape Velocity with Saturn V Rocket

Effect of Sun on Escape Velocity from Earth

Gravitational Escape Velocity for a Black Hole

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## Resources

Gravity Resources

Gravitation Resources

Physics Resources

Astronomy Resources

Experiments and Science Fair Projects

Biographies

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