QuantumFracture

PBS Space Time Have you ever asked “what is beyond the edge of the universe?” And have you ever been told that an infinite universe that has no edge? You were told wrong. In a sense. We can define a boundary to an infinite universe, at least mathematically. And it turns out that boundary may be as real or even more real than the universe it contains. Ramp: Forces and Motion - Force Topics Force Position Velocity Acceleration Description Explore forces and motion as you push household objects up and down a ramp. Lower and raise the ramp to see how the angle of inclination affects the parallel forces.

Molecules and Light - Molecules Topics Molecules Photons Absorption Light Description Turn light source on to explore. Observe what happens in the observation window as you set up different combinations of light source and molecule. Friction - Thermodynamics Topics Friction Thermodynamics Heat Description Balmer Series The Bohr Model Niels Bohr proposed a model for the hydrogen atom in 1913 that described discrete energy states are associated with a fixed electron orbit around the nucleus. Importantly, an atom cannot discharge energy while its electrons are in stationary states. Gravity And Orbits - Gravitational Force Topics Gravitational Force Circular Motion Astronomy Description 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! Sample Learning Goals

Forces and Motion: Basics - Force Topics Force Motion Friction Speed Newton's First Law Description Ch. 8 Conceptual Questions - University Physics Volume 3 Want to cite, share, or modify this book? This book is Creative Commons Attribution License 4.0 and you must attribute OpenStax. Attribution information If you are redistributing all or part of this book in a print format, then you must include on every physical page the following attribution: Access for free at If you are redistributing all or part of this book in a digital format, then you must include on every digital page view the following attribution: Access for free at Citation information Use the information below to generate a citation.

Vector Addition - Vectors Topics Vectors Vector Components Vector Addition Equations Description Explore vectors in 1D or 2D, and discover how vectors add together. Specify vectors in Cartesian or polar coordinates, and see the magnitude, angle, and components of each vector. Experiment with vector equations and compare vector sums and differences.