Khan Academy: Finding an in Between Frame of Reference

The instructor explores the plates in the makeup of Earth's surface. Evidence and theories about plate tectonics are featured. [8:00]

Discover how to find the units for the rate constant k for a zero, first, or second order reaction. [5:05]

Video lesson features a discussion of yeast and cell signaling in yeast reproduction. [8:02]

This video lesson explores how homologous chromosomes exchange fragments in prophase I. [12:15]

In this video, David from Khan Academy explains how to find the normal force on a bowling ball rolling in a vertical loop. [8:48]

In this video, David from Khan Academy explains how to find the tension in a string that is whirling a yo-yo in a vertical circle. [10:30]

In this video, David from Khan Academy explains how to solve for the tension and speed of a mass swinging at an angle in a horizontal circle. [12:38]

Watch how PV loops can be 'morphed' into PV boxes to make drawing them and thinking about them much simpler. Rishi is a pediatric infectious disease physician and works at Khan Academy.

Is post-stroke inflammation common? Khan Academy fills us in with what it is and why it occurs. [5:55]

Explore how different frames of reference affect your perception of motion in this interactive activity from the American Museum of Natural History.