Interactive
PBS

Pbs Learning Media: Frequency

For Students 9th - 10th
In this interactive activity adapted from the University of Utah's ASPIRE Lab, students will investigate frequency in terms of trampoline jumps, pendulum swings, and electromagnetic waves.
Website
Other

Institute of Physics: Practical Physics

For Teachers 9th - 10th
Access hundreds of teacher-tested, practical physics lessons on this well-organized, illustrated site. Find just the right demonstration, attention-grabber, or lab for any physics teaching objective at your fingertips.