#### NSDL teaching resources related to “gravity”

These lecture notes cover the contributions that Tycho, Galileo, Kepler, and Newton made leading up to the discovery of gravity.

#### The Discovery of Gravity

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This web page outlines an experiment to measure the effects of gravity for objects on the scale of kilograms. It begins by introducing the principles of gravity and comparing it against other forces. After demonstrating the weakness of the effects of gravity, the author performs an experiment to demonstrate that the effects of gravity are still detectable. The detailed specifications of the experimental setup are given, along with an explanation of the role of each part, so that it can be reproduced anywhere else.

#### Bending Spacetime in the Basement

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This animation shows the quantum analogy of a classical bouncing ball moving in a gravitational field, without dissipation. The video shows the wave packet motion next to the ball. A graph of the expectation value of the quantum ball versus time is provided that illustrates the dispersion and later reforming of the quantum wave packet.

#### A Quantum Bouncing Ball

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This web page provides a multimedia introduction to gravity. It includes topics such as forces, acceleration, Newton’s laws, orbits, escape velocity, black holes, etc. Short video clips, still images, graphs, and diagrams are integrated with text to promote understanding of important concepts. This tutorial is part of the PhysClip collection of web-based resources on introductory mechanics, electricity, and magnetism.

#### Physclips: Gravity, Newton's laws and the orbits of the planets

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This interactive simulation helps the user to visualize the gravitational force that two objects exert on each other. It features two spherical objects whose masses can be changed by the user from 1-100 kg. It was designed to build understanding of how the gravitational force between two objects is affected by their masses and by the distance between them. Also included are teaching tips and lesson plans for use in high school and lower-level undergraduate physical science courses.

#### PhET Simulation: Gravity Force Lab

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This web page from the Exploratorium museum helps students understand the difference between mass and weight. Enter an “Earth weight”, and the site automatically calculates your weight on the moon, other planets, and three stars. It also includes background information on the relationship between gravity, mass, and distance.

#### Exploratorium: Your Weight on Other Worlds

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