Friday, November 16, 2012

Waves on Strings (Levels: Intro, APB)

This podcast explains standing waves on strings, including an explanation for how to calculate which frequencies of vibration will 'work' to cause a certain string to resonate at all of its different harmonic frequencies.

Static Equilibrium (Levels: Intro, APB, APC)

This podcast introduces the idea of static equilibrium, once students are already familiar with torque concepts.

Intro to Sound Waves (Levels: Intro, APB)

This podcast describes several sound wave properties, and introduces the sound wave phenomena of Doppler Effect and Beat Frequency. Simple calculations are also briefly discussed.

Thursday, November 15, 2012

Forces During Rolling (Level: APC)

This podcast explains how to examine forces and torques while an object is rolling.

Torque & Newton's 2nd Law for Rotation (Level: APC)

This podcast explains what torque is, and how to calculate it.  Newton's 2nd Law is also revisited, from a rotational perspective.