SHM Model Answers

Question 1

Define simple harmonic motion

Answer 1

Acceleration is proportional to displacement from equilibrium
Acceleration is in opposite direction to equilibrium position/ directed towards equilibrium position

Question 2

When the amplitude of the oscillations of a pan reach a certain value, the mass resting on it leaves contact with the scale pan. When does this happen?

Answer 2

Separates at amplitude position (at top of motion)
As the two are not attached, the mass accelerates downwards with acc = g whereas the plate accelerates downwards with acc = a_max
Separation occurs when a_max>g

Question 3

Explain what is meant by a forced vibration.

Answer 3

System made to oscillate by a periodic external force/energy source
OR system made to oscillate by another oscillator it is connected to
OR another oscillator causing system to vibrate
OR an oscillator causing another oscillator to vibrate due to its own oscillations