Lesson 5.1b Worked examples on oscillations

Lesson 5.1b Worked examples on oscillations - Important...

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Unformatted text preview: Important formulae for problem solving in oscillations. The displacement of a simple harmonic motion: y = A sin ( ϖ t + δ ) Velocity of a simple harmonic motion: v = A ϖ cos ( ϖ t + δ ) Acceleration of a simple harmonic motion: a = - A ϖ 2 sin ( ϖ t + δ ) = - ϖ 2 y y max = A (amplitude) v max = A ϖ a max = A ϖ 2 k m ϖ = 2 T π ϖ = = 2 π f 1 f T = 2 m T k π = F = - kx 1 The potential energy of a stretched spring: U = ½ kx 2 The total energy of an oscillating object: E = ½ kA 2 The kinetic energy of an oscillating mass: K = ½ mv 2 The maximum kinetic energy occurs at the equilibrium position: K max = ½ mv max 2 = ½ kA 2 max k v A A m ϖ = = 2 A 2.0 kg object is attached to a horizontal spring of force constant k = 5 kN.m-1 . The spring is stretched 10 cm from the equilibrium position and released. Find (a) the period, (b) the frequency, and (c) the amplitude of the motion. (d) What is its maximum speed? (e) What is its maximum acceleration? When does the object first reach the equilibrium position? What is the acceleration at this time ? m = 2kg, 2 kg A = 0.1 m (a) Period T is given by: -1 2 kg 2 5000 Nm π = = 0.126 s 2 m T k π = Example 1 3 A 2.0 kg object is attached to a horizontal spring of force constant k = 5 kN.m-1 . The spring is stretched 10 cm from the equilibrium position and released. Find (a) the period, (b) the frequency, and (c) the amplitude of the motion. (d) What is its maximum speed? (e) What is its maximum acceleration? When does the object first reach the equilibrium position? What is the acceleration at this time ? m = 2kg, 10 cm 2 kg A = 0.1 m Example 1 (b) 1 f T = 1 0.126 s = = 7.94 Hz (c) Since the spring is stretched 10 cm from the equilibrium position, this is the maximum displacement of the object. A = 0.1 m T = 0.126 s 4 A 2.0 kg object is attached to a horizontal spring of force constant k = 5 kN.m-1 . The spring is stretched 10 cm from the equilibrium position and released. Find (a) the period, (b) the frequency, and (c) the amplitude of the motion. (d) What is its maximum speed? (e) What is its maximum acceleration? When does the object first reach the equilibrium position? What is the acceleration at this time ? f = 7.94 Hz 10 cm 2 kg A = 0.1 m Example 1 (d) The angular frequency ϖ is given by: ϖ = 2 π f = 2 π (7.94) = 49.9 Hz = 0.1 m × 49.9 s ≈ 5.0 ms-1 5 A 2.0 kg object is attached to a horizontal spring of force constant k = 5 kN.m-1 . The spring is stretched 10 cm from the equilibrium position and released. Find (a) the period, (b) the frequency, and (c) the amplitude of the motion. (d) What is its maximum speed? (e) What is its maximum acceleration? (f) When does the object first reach the equilibrium position?...
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This note was uploaded on 05/01/2011 for the course PHY 2048 taught by Professor George during the Fall '10 term at Edison State College.

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Lesson 5.1b Worked examples on oscillations - Important...

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