Pendulum laboratory and resonance
Answers are for parents and teachers.
1
A pendulum is 1 m long, T = 2 s. What is g ≈ π² (m/s²)? (π² ≈ 9.87; to 0.1)
9.9
2
A pendulum makes 40 oscillations in 80 s. What is the period (s)?
2
3
A swing has a natural period of 4 s. What driving frequency (Hz, decimal) gives resonance?
0.25
4
Why can a car start to shake strongly on a road with rhythmic bumps?
If the bump frequency equals the car’s natural frequency, resonance occurs.
5
How does the resonance amplitude change when friction increases?
It decreases; the peak becomes lower and broader.