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1. The response of a dynamic system to suddenly applied
nonperiodic excitations is called transient response. If the
frequency of excitation coincides with the natural frequency
of the system, the response of the system will be very large.
This condition is known as resonance, which should be
avoided to prevent failure of the system.

5. • 10. What is the effect of a viscous damping on the amplitude
of forced vibration near the resonant condition?
• Viscous damping is damping that is proportional to the velocity
of the system. That is, the faster the mass is moving, the more
damping force is resisting that motion. Fluids like air or water
generate viscous drag forces.
• Viscous damping inhibits the out-of-control vibrations that would
otherwise be seen at resonance.
11 If the ‘ride’ of a vehicle is poor while moving on a uniformly
bumpy road will a change in speed improve the condition?
A change in speed may improve the condition of the ride, but it
may make it worse either way.