Chapter 6: Forced oscillations - 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 of high damping is

• 1

• 2

• 3

• no one

Undamped oscillatory motion is necessarily periodic, but periodic motion is not necessarily an oscillatory motion.

• True

• False

An oscillator is said to be driven if a device allows, at regular intervals of time, to communicate energy to the oscillator to compensate losses due to friction.

• False

• true

The curve that represents the free undamped oscillations is

• 
• 
• 

The proper period T of an oscillator depends on the initial conditions.

• True

• False

In free damped mechanical oscillations:

• The object oscillates with a decreasing amplitude.

• The object oscillates with a period called the pseudo-period T.

• The pseudo-period T is slightly greater than the proper period T₀ .

• All

The proper period of these oscillations is

• 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. The position(s) of the particle when 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