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Edexcel A-Level Physics A2 5.5.150 Energy Conservation in Oscillating Systems Questions

Practise Edexcel A-Level Physics energy conservation in oscillating systems by linking kinetic energy, amplitude, displacement and damping.

Syllabus
Pearson Edexcel International Advanced Subsidiary/Advanced Level
Course
Physics XPH11/YPH11
Level
A2

Exam points

  • calculate maximum kinetic energy from amplitude and period using vmax = Aω and Ek = 1/2 mv²
  • sketch total or kinetic energy against displacement for a mass-spring oscillator
  • explain energy conservation in driven or damped oscillations with transfer to surroundings

Edexcel A-Level Physics A2 5.5.150 Energy Conservation in Oscillating Systems Questions question 1

[Maximum number: 3]

A student hangs a mass of 0.22 kg from two identical springs as shown.

Figure for Question Edexcel A-Level Physics A2 5.5.150 Energy Conservation in Oscillating Systems Questions question 1 — Edexcel A-Level Physics A2

She displaces the mass vertically and the mass oscillates with simple harmonic motion.

The student attaches the mass to one spring and holds the other end. She sets the mass into oscillation by oscillating her hand vertically, as shown.

Figure for Question Edexcel A-Level Physics A2 5.5.150 Energy Conservation in Oscillating Systems Questions question 1 — Edexcel A-Level Physics A2

The student increases the frequency at which she oscillates her hand. She keeps the amplitude of oscillation of her hand constant.

She observes that the amplitude of oscillation of the mass increases to a maximum and then decreases.

The student makes the following conclusion:
"As the frequency is increased, the amplitude of the mass increases to a maximum, so energy conservation does not apply to this situation."

Explain whether her conclusion is correct.

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