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Mechanical Properties of Fluids
Question
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At a certain speed of a bus, the body of the bus starts vibrating strongly. Why?

Answer

The frequency of the bus engine becomes equal to the natural frequency of it's frame at a certain speed. This is the condition of resonance and resonant vibrations of the frame takes place. Therefore, we feel strong vibrations of the bus. 

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Some More Questions From Mechanical Properties of Fluids Chapter

What is the condition for motion to be simple harmonic motion?

In the displacement equation y = r sin(ωt/ + ϕ) what does ϕ called and what information does it give?

What determines the natural frequency of an oscillator?

Is there any relation between uniform circular motion and simple harmonic motion?

What is periodic motion?

Write down the expression for the instantaneous velocity and acceleration of particle vibrating in simple harmonic motion.

How do you define the mean position of particle executing simple harmonic motion?

Define amplitude.

What is the net displacement of the particle executing simple harmonic motion in one complete oscillation?