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Mechanical Properties of Fluids
Question
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Why does the motion of simple pendulum in due course stop while oscillating in air?

Answer

A simple pendulum oscillates in air, due to air friction.
The energy of the oscillator is dissipated into heat energy.
When whole of the energy of simple pendulum is dissipated, the simple pendulum stops oscillating. 

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Some More Questions From Mechanical Properties of Fluids Chapter

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?

Are all the periodic motions simple harmonic?

Does the time period of particle vibrating in simple harmonic motion depend upon its displacement?