Electric flux

The electric flux is proportional to the number of electric field lines going through a surface. This animation illustrates the 3 parameters influencing the electric flux: the area of the surface crossed by electric field lines, the magnitude of the electric field and the angle between the electric field and the surface. In the animation, the electric field lines are green when they cross the surface, and become yellow when they don't cross the surface.

Other animations by Yves Pelletier

Gravity - Sixty Symbols

What is the difference between big "G" and little "g"... And what is gravitational lensing?

Source:  Sixty Symbols

Other Sixty Symbols videos

Eureka! Episode 22 - Atoms

This program explains that molecules are made up of atoms. In pure metals, all the atoms are arranged separately in a lattice-work pattern, but in most non-metals, liquids, and gases, the atoms are bunched together into molecules.

Other Eureka episodes

Pop Can Stay-on Tab (levers)

Using slow motion video Bill Hammack shows the ingenious engineering design of a pop can stay-on tab. To use the least amount of material it was designed to change, while in motion, from a 2nd to a 1st class lever.

Other "Engineer Guy" videos

MIT 8.01 Classical Mechanics Lecture 18

MIT Physics Course

Professor Walter Lewin

8.01 Physics  I: Classical Mechanics, Fall 1999

Exam review: mostly work energy theorem and conservation of energy.

See other videos in this series.