Any physics or math websites?

[hemmings123]

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Do you know of any good physics or math online websites that go through certain concepts and explain them and also have online oractice tests and questions with answers? Or maybe even apps for an Iphone? Thank you.

 

[Nave]

Khan Academy!

 

[NotMichael]

Kahn academy is really great. Also, Physics Classroom gives more readings instead of videos that are really good.