Watch Apollo 15 astronaut David Scott perform Galileo's falling objects experiment on the Moon in this video segment from NASA. [0:47]

Learn about whether a feather or a brick would fall faster on the moon in this video lecture. Understand how air resistance affects how objects fall to Earth. [10:34]

View this video and discover the four main ways that particles, atoms, and molecules move in liquid. This video segment demonstrates what sedimentation, buoyancy-driven convection, diffusion, and capillarity are and how gravity impacts...

Watch this video and learn what microgravity is and how space shuttles experience continuous fall. Learn how to recreate microgravity here on Earth. [2:20]

Do you want to be an astronaut? Would you like to someday walk on the moon? Well, you better learn a little about gravity so you can escape from Earth and head into space. Today, Sabrina chats with us about what it takes to get to the...

A second video on the topic of the law of gravitation. It examines gravitational forces on a planet and in space.

Use the principles of physics to understand the force of a bouncing object. [6:49]

A video tutorial explaining the physics behind the gravitational force of an object at rest. [3:46]

This tutorial provides a mathematical interpretation of kinetic friction as compared with a normal force. [4:27]

This video segment shows different equipment used to study microgravity. This video demonstrates equipment such as drop tower, research aircraft, and a rocket. [0:44]

In this video, David from Khan Academy gives some problem solving strategies for centripetal force problems and explains many common misconceptions people have about centripetal forces. [14:59]

What would fall faster on the moon, a brick, or a feather? Sal Khan answers this question in this video. [10:34]

I'm sure you've all heard about Isaac Newton and that apple that fell on his head and how that was a huge deal to our understanding of gravity. Well, let's talk about that. In this video episode of Crash Course Physics, Shini sits down...

This lesson explains how gravitational force is related to free fall, acceleration due to gravity, and Newton's second law of motion.

This lesson explains what happens to the gravitational force for an object at rest. It is 2 of 2 in the series titled "Gravitational Force & Objects at Rest."

This lesson introduces the concept of gravitational force and explains how it is experienced. It is 2 of 2 in the series titled "Introduction to Gravitational Force."

This lesson provides the learner with example problems on calculating gravitational force. It is 2 of 2 in the series titled "Practice w/ Gravitational Force."

This lesson demonstrates how to determine the gravitational force acting on an object. It is 2 of 2 in the series titled "Calculating Gravitational Force."

This lesson demonstrates how to determine the gravitational force acting on an object. It is 1 of 2 in the series titled "Calculating Gravitational Force." [3:49]

Learn about this simple machine, and see how it reduces the effort required to move certain objects through this fun and animated learning module.