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| Question | Answer |
| Define simple harmonic motion | osscilation in which acceleration of the object is directly proportional to its displacement from the midpoint, directed to the midpoint |
| How does energy change through simple harmonic motion? | max gpe converts to ke max ke converts to gpe to mak gpe and repeats some enrgy lost to surroundings |
| What is the sum of the potential and kinetic energy called? | The mechanical energy which stays constant |
| What does the graph of displacement against T look like ? |
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Picture1 (image/jpg)
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| What does the graph of velocity against T look like? |
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Picture2 (image/jpg)
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| What does the graph of acceleration against T look like? |
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Picture3 (image/jpg)
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| What do frequency and period not depend on? | Amplitude |
| What is a free vibration and what does it mean? | No transfer of energy to and from the surroundings If you pulled a sping it would keep on oscillating with the same amplitude forever |
| What is a spring vibrating in the air called? | A free Vibration |
| When do forced vibrations happen ? | When theres an external force |
| What is the frequency of a forced virbration called? | The driving frequency |
| When does resonance happen? | When the driving frequecy= the natural frequency |
| What happens when a system is resonating? | The system gains more energy from the driving force and vibrates with a rapidly increasing amplitude |
| When does damping happen? | When energy is lost to the surroundings |
| Why are some systems deliberatley damped? | to stop them osscilating or to minimise the effect of resonance |
| What are the four types of damping? | Light damping,heavy damping,critical damping and overdamping |
| What does damping reduce? | The amplitude of the oscilation over time |
| The heavier damping the... | quiker the amplitude is reduced to zero |
| Which type of amplitude reduces the amplitude in the shortest possible time? | Critical damping |
| When a system is overdamped what happens? | It takes longer to return to equilibrium |
| What does damping also effect? | resonance |
| Lightly damped systems have a ... | very sharp resonance peak |
| Heavily damped systems... | Have a latter resonance peak |
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