Forced Vibrations and Resonance: Natural Frequency, Damping and Phase | A-Level Physics

Why does a washing machine shake violently at one spin speed, then calm down as the drum spins faster? This A-level Physics lesson explains forced vibrations and resonance from the mechanism up: natural frequency, driving frequency, energy transfer, response curves, damping, phase and stationary-wave resonance. You will learn to: distinguish free vibration from forced vibration state the resonance condition and explain why amplitude grows sketch and interpret amplitude–frequency curves describe how damping lowers and broadens the resonance peak track the phase of displacement relative to the driving force connect resonance to stationary waves and real engineering systems explain energy loss through resistive forces and, for Pearson Edexcel, plastic deformation Full lesson notes: https://inklearning.co.uk/physics/per... 18 original practice questions and mark schemes: https://inklearning.co.uk/physics/pra... Revise SHM systems first: https://inklearning.co.uk/physics/per... Review stationary waves: https://inklearning.co.uk/physics/wav... Explore the Periodic motion unit: https://inklearning.co.uk/physics/per... Chapters: 00:00 Why one spin speed shakes 00:19 Free vibration and natural frequency 01:27 Forced vibration and driving frequency 01:47 Timing, not just force 02:26 Why resonance builds energy 03:22 Reading the response curve 03:56 How damping changes the peak 04:11 The real-system peak shift 04:51 Phase through resonance 05:40 Stationary-wave resonance 06:09 How damping removes energy 06:26 Plastic deformation 07:01 Useful and dangerous resonance 07:25 Solving the washing-machine puzzle 08:04 Causal summary 08:23 Next course: thermal physics Designed for A-level Physics students following AQA, OCR A, Pearson Edexcel or Cambridge International. InkPhysics is an independent study resource and is not affiliated with or endorsed by any awarding body. #ALevelPhysics #Resonance #ForcedVibrations