Tag Archives: Energy

Unit 5. Oscillation

1 Sep
Bode plot of the frequency response of an idea...

Bode plot of the frequency response of an ideal harmonic oscillator. (Photo credit: Wikipedia)

Schrodinger equation - harmonics

Schrodinger equation – harmonics (Photo credit: Ethan Hein)

English: Animation demonstrating the simple ha...

Position, velocity and acceleration of an harm...

English: This animation depicts a simple pendu...
English: This animation depicts a simple pendulum consisting of a mass suspended by a light string and released from a small lateral displacement. If the amplitude is very small and the system is undamped, it behaves as a simple harmonic oscillator. (Photo credit: Wikipedia)
Sinusoidal waves correspond to simple harmonic...

Sinusoidal waves correspond to simple harmonic motion. (Photo credit: Wikipedia)

Diagram of a simple gravity pendulum.

Diagram of a simple gravity pendulum. (Photo credit: Wikipedia)

Illustration of a Simple harmonic oscillator

Illustration of a Simple harmonic oscillator (Photo credit: Wikipedia)

Oscillations

1. Recall that the condition for simple harmonic motion is F = –kx, and hence identify situations in which simple harmonic motion will occur    Spec-119

2. Recognize and use the expressions a = – ω2x,           a = –2 cos ωt, v = sin ωt, x = Acos ωt and      T = 1/f = 2π/ω as applied to a simple harmonic oscillator Spec-120.

3. obtain a displacement – time   graph for an oscillating object and recognize that the gradient at a point   gives the velocity at that point  Spec-   121

4. Recall that the total energy of an undammed simple harmonic system remains constant and recognize and use expressions for total energy of an oscillator. Spec-122

5. Distinguish between free, damped and forced oscillations.  Spec- 123

6. Investigate and recall how the amplitude of a forced oscillation changes at and around the natural frequency of a system and describe, qualitatively, how damping affects resonance. Spec-124

7. Explain how damping and the plastic deformation of ductile materials reduce the amplitude of oscillation.                                                                             Spec 125.

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Electric and Magnetic Fields.

22 Aug
English: Field of a positive and a negative po...

English: Field of a positive and a negative point charge. Thumbnail version (Photo credit: Wikipedia)

Charged particle drifts in a homogeneous magne...

English: Fleming's left hand rule shows the di...

English: Fleming’s left hand rule shows the direction of the thrust on a conductor carrying a current in a magnetic field. (Photo credit: Wikipedia)

Statement Spec ref Comments
explain what is meant by an   electric field and recognise and use the expression electric field strength E   = F/Q

83

draw and interpret diagrams using   lines of force to describe radial and uniform electric fields qualitatively

84

use the expression F = kQ1Q2/r2,   where k = 1/4πε0 and derive and use the expression E = kQ/r2   for the electric field due to a point charge

85

investigate and recall that   applying a potential difference to two parallel plates produces a uniform   electric field in the central region between them, and recognise and use the   expression E = V/d

86

investigate and use the   expression C = Q/V

87

recognise and use the expression W   = ½ QV for the energy stored by a capacitor, derive the expression   from the area under a graph of potential difference against charge stored,   and derive and use related expressions, for example, W = ½ CV2

88

investigate and recall that the   growth and decay curves for resistor–capacitor circuits are exponential, and   know the significance of the time constant RC

89

recognise and use the expression Q   = Q0 e−t/RCand derive and use   related expressions, for exponential discharge in RC circuits, for example, I   = I0e−t/RC

90

explore and use the terms   magnetic flux density B, flux Φ and flux linkage NΦ

91

investigate, recognise and use   the expression         F = BIl   sin θ and   apply Fleming’s left hand rule to currents

92

recognise and use the expression F   = Bqv sin θ and apply Fleming’s left hand rule to charges

93

investigate and explain   qualitatively the factors affecting the emf induced in a coil when there is   relative motion between the coil and a permanent magnet and when there is a   change of current in a primary coil linked with it

94

investigate, recognise and use   the expression ε = −d(NΦ)/dt   and explain how it is a consequence of Faraday’s and Lenz’s laws

95

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