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Mechanical Properties of Fluids
Question
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What are forced vibrations?

Answer

When a body is continuously driven by an external force, and if it is maintained in a state of vibration, it is known as forced vibrations. 
The body is maintained in a state of vibration by periodic force of frequency other than natural frequency of vibration of body. 

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Some More Questions From Mechanical Properties of Fluids Chapter

What is an oscillatory motion?

What is time period?

Define frequency.

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.