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For more information, please see full course syllabus of AP Physics B
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Lecture Comments (2)

1 answer

Last reply by: Jamal Tischler
Tue Dec 22, 2015 1:12 AM

Post by Hawa Muse on October 3, 2012

If a block has a mass of 100kg and initial velocity 80 mls if the coefficient of kinetic friction is 0.55 and a person stands 150 meters away will the block crash him?

Traveling Waves

  • A mechanical wave is a self sustaining disturbance of a medium that propagates within the medium carrying energy and momentum.
  • Mechanical waves require (1) a source of disturbance, (2) a medium that can be disturbed, and (3) a mechanism by which a portion of the region can influence adjacent regions.
  • In a transverse wave, such as a wave on a string, the displacement is perpendicular to the direction of propagation of the wave.
  • In a longitudinal wave, such as a compression wave in a spring, the displacement is along the direction of propagation of the wave.
  • The speed of a mechanical wave is determined by the properties of the medium in which the wave propagates.
  • A wave on a string travels with a speed equal to SQRT (T/mu), where SQRT stands for square root, T is the tension in the string, and mu is the mass of the string divided by its length.
  • If a pulse strikes a fixed boundary, the reflected wave will be inverted. No inversion occurs if the boundary is free.

Traveling Waves

Lecture Slides are screen-captured images of important points in the lecture. Students can download and print out these lecture slide images to do practice problems as well as take notes while watching the lecture.

  • Intro 0:00
  • What is a Wave? 0:19
    • Example: Rod and Swinging Balls
    • Huge Number of Atoms
    • Disturbance Propagates
    • Source of Disturbance
    • Wave Propagation
    • Mechanism of Medium
    • Disturbance Moves
  • Types of Waves 12:52
    • Transverse Wave
    • Longitudinal Wave
  • Sinusoidal Waves 26:47
    • Every Cycle has 1 Wavelength
    • Time for Each Cycle
    • Speed of Wave
  • Speed of Wave on Strings 42:24
    • Formula for Wave Speed
  • Example 51:25
    • String with Blade Generate Pulse
  • Reflection of Waves 55:18
    • String Fixed at End
    • Wave Inverted
    • Wave on a Frictionless Ring
    • Free End: No Inverted Reflection
  • Extra Example 1: Tension in Cord
  • Extra Example 2: Waves on String
  • Extra Example 3: Mass on Cord with Pulse