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# lecture25_post - 13 Vibrations and Waves Found everywhere...

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13. Vibrations and Waves Found everywhere in the universe and in daily life. • hearing and vision. • Ultrasound diagnostics. Image: Absorption, Transmission, and Reflection of ultrasound

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Spring Force Hooke’s Law gives the force F = - k x • F is the restoring force • F is in the opposite direction of x •k is spring constant • k is larger for a stiffer spring • x = 0 is the equilibrium position F x Slope = -k 2 2 1 kx PE s =
1.Force always points towards the equilibrium position 2.It is called the restoring force. Two requirements: (1) F = -kx (2) No friction Simple harmonic motion

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• Amplitude, A – The amplitude is the maximum position of the object relative to the equilibrium position – In the absence of friction, an object in simple harmonic motion will oscillate between the positions x = ± A Simple harmonic motion
• The period, T, is the time that it takes for the object to complete one complete cycle of motion

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lecture25_post - 13 Vibrations and Waves Found everywhere...

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