Crash Course Kids combines the same engaging lecture-style content delivery with animated graphics that focus on grade school science.

Topics include Earth Science, Physical Science, Biology, Geography, Engineering, and Astronomy.

These videos are amazing!

Move the sun, earth, moon and space station to see how it affects their gravitational forces and orbital paths. Visualize the sizes and distances between different heavenly bodies, and turn off gravity to see what would happen without it!

This is an activity about gravity. Learners will design their own experiments to explore the fundamental force of gravity and then extend their thinking to how gravity acts to keep objects like moons and ring particles in orbit. They use the contexts of the solar system and the Saturn system to explore the nature of orbits. The lesson enables students to correct common misconceptions about gravity and orbits and to learn how orbital speed decreases as the distance from the object being orbited increases. This is lesson 3 of 6 in the Saturn Educators Guide.

Build your own system of heavenly bodies and watch the gravitational ballet. With this orbit simulator, you can set initial positions, velocities, and masses of 2, 3, or 4 bodies, and then see them orbit each other.

Lesson plans, worksheets and answer keys for Physics 30: Unit 3 - Circular Motion and Gravitation.

Students explore orbit transfers and, specifically, Hohmann transfers. They investigate the orbits of Earth and Mars by using cardboard and string. Students learn about the planets' orbits around the sun, and about a transfer orbit from one planet to the other. After the activity, students will know exactly what is meant by a delta-v maneuver!