NASA
Nasa: The Space Place: What Is Gravity Really?
What is known about gravity? Find out Einstein's thoughts on gravity in a brief overview of this mysterious force.
Science Struck
Science Struck: What Is Gravity and How Does It Work
A very detailed look at gravitational force and the many theories that have been put forward to try to explain it. Includes lots of illustrations.
CK-12 Foundation
Ck 12: Kindergarten Science: What Is Gravity?
[Free Registration/Login may be required to access all resource tools.] Students learn about the Law of Gravity and how it affects planets, objects, animals. and people. Includes a few questions to check for understanding.
Mocomi & Anibrain Digital Technologies
Mocomi: What Is Gravity?
Investigate what keeps us grounded and who spent a lot of time studying its details. How does gravity impact plant growth?
Texas Instruments
Texas Instruments: What Is Gravity?
In this activity, students will perform a series of experiments with inclined planes. They will learn that as the angle of inclination of the inclined plane approaches 90 degrees, the value of the acceleration of the cart traveling down...
Texas Instruments
Texas Instruments: What Is Gravity? Activity Modeling Motion
This activity serves as a follow-up to Activity 4 in the Explorations book, Modeling Motion: High School Math Activities with the CBR by Linda Antinone, Sam Gough, and Jill Gough (Texas Instruments Incorporated, 1997).
Khan Academy
Khan Academy: What Is Newton's First Law?
Newton's First Law also called the law of inertia is the most important thing to realize about motion. This article offers more information on motion and explains solved problems involving Newton's First Law. Also included is a video...
Khan Academy
Khan Academy: What Is Newton's Third Law?
This article offers a description and real-life examples of Newton's Third Law. Practice questions are included to test your knowledge!
Khan Academy
Khan Academy: What Is Weight?
This article on weight will help you prepare for the AP Physics test. Included are example problems to help you practice.
TED Talks
Ted: Ted Ed: How to Think About Gravity
Video describes what gravity is and how it operates between two masses. Followed by a short quiz and a list of additional resources to explore. [4:44]
Ducksters
Ducksters: Physics for Kids: Gravity
Kids learn about the science behind gravity, the mysterious force of planet earth including why it is important, what is weight, and fun facts. What is gravity?
American Museum of Natural History
American Museum of Natural History: Meet the Universe's Main Attraction Gravity
Illustrated and animated series of short articles answers the questions, what is gravity? and what does it do?
Science Education Resource Center at Carleton College
Serc: Investigating the Constancy of Gravity: Free Fall Using a Water Bottle
In this physics interactive lecture demonstration, students will predict what will happen if a plastic bottle, filled with water and having a hole near the bottom, is dropped. Will the bottle fall at the same rate as the water inside the...
E-learning for Kids
E Learning for Kids: Science: Egypt: What Can Forces Do?
A learning module reviewing how much force is needed to push or pull objects. Also learn about the force of gravity.
E-learning for Kids
E Learning for Kids: Science: Pirates: What Are Some Forces Around Us?
Covers the meanings of force, friction, and gravity, and the differences between magnetic and elastic spring force, and between weight and mass. The effect of air resistance on an object's motion is also touched upon.
Khan Academy
Khan Academy: The Buoyant Force Does Not Get Smaller as You Sink
This article explains the buoyant force using a submarine as an example. It also discusses what determines the size of the buoyant force using a formula, and explains decompression sickness better known as the bends.
Other
Fuel Our Future Now: Grade K 2 Module: Vroom! Vroom! What Makes Cars Go? [Pdf]
In this K-2 teaching module, students explore motion, gravity, friction, and energy using objects and model cars. They investigate using hands-on activities with vehicles, as well as online interactives and videos. The culminating event...
My Science Site
My Science Site: What Drops Faster? [Pdf]
This resource provides a simple science activity teachers can use to teach gravity and mass. This resource is in PDF form; requires Adobe Reader.
NASA
Nasa: The Space Place: What's a Barycenter?
This site from NASA helps in explaining a barycenter. "In the case of the Earth and the Sun, both bodies actually revolve, or spin, around the center of the mass between them. This point is called the barycenter."
TeachEngineering
Teach Engineering: What a Drag!
The purpose of this activity is to demonstrate how drag affects falling objects. Students will make a variety of shapes out of paper and see how size and shape affects the speed with which their paper shapes fall. They will also be able...
BBC
Bbc: Gcse Bitesize: Mass, Weight and Gravitational Field Strength
This lesson focuses on gravitational fields and includes what one is, the formula for gravity force, defining weight, formula for mass, an example of how to calculate gravity force, a practice question, and a link to a test.
Wikimedia
Wikipedia: Specific Gravity
Wikipedia offers a brief explanation on what specific gravity is and why it is measured in terms of density of water. The equation for its measurement is also given.
Other
Fermi Laboratory:how Strong Is the Strong Force?
Use this site to learn about the four forces of nature. Also learn what determines the strength of a force. This question and answer site is a link of the Fermi National Accelerator Laboratory.