**Oscillations**

## Specification:119 recall that the condition for simple harmonic motion is
F = -kx, and hence identify situations in which simple harmonic motion will occur120 recognise and use the expressions a = -ω^2x, a = -Aω^2 cos ωt, v = Aω sin ωt, x = Acos ωt and T =1/f =2π/ω as applied to a simple harmonic oscillator121 obtain a displacement – time graph for an oscillating object and recognise that the gradient at a point gives the velocity at that point Use a motion sensor to generate graphs of SHM 122 recall that the total energy of an undamped simple harmonic system remains constant and recognise and use expressions for total energy of an oscillator 123 distinguish between free, damped and forced oscillations 124 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. Use, for example, vibration generator to investigate forced oscillations 125 explain how damping and the plastic deformation of ductile materials reduce the amplitude of oscillation. Use, for example, vibration generator to investigate damped oscillation |