Forced oscillations and Resonance

What is the effect of damping on resonance?

• decrease slightly the value of proper frequency.

• reduce the maximum amplitude of an oscillator.

• The shape of the curve of resonance becomes broad.

• All

The curve with the greatest damping is

• 1

• 2

• 3

• all curves have the same amount of damping

The curve that represents the free undamped oscillations is

• 
• 
• 

In free damped mechanical oscillations:

• The object oscillates with a decreasing amplitude.

• The object oscillates with a constant period.

• The amplitude of the oscillation decrease exponentially.

• all of the above

Use the graph to calculate the period.

• 0.5 s

• 1.25s

• 1.1s

• 0.6s

A particle moves in simple harmonic motion with a frequency of 3Hz and amplitude of 5cm. What is the x value of the particle when the magnitude of the acceleration a is maximum?

• ± 5cm

• + 5 cm

• +10 cm

• -5 cm

A particle moves in simple harmonic motion with a frequency of 3Hz and amplitude of 5cm. The distance covered by the particle during one complete oscillation is

• 10cm

• 5 cm

• 15cm

• 20cm

When a large number of people walk across a suspension bridge simultaneously the bridge may be set into oscillation. This is an example of

• forced oscillation.

• free oscillation.

• natural oscillation.

• normal oscillation.

Determine the resonant frequency of this system

• 4.6 Hz

• 6.2 Hz

• 17 Hz

• 5 Hz

This kind of damping stops the oscillation in the shortest possible time

• light damping

• heavy damping

• critical damping

• overdamping