Which of the following statements is/are true for coulomb damping?1. Coulomb damping occurs due to friction between two lubricated surfaces2. Damping force is opposite to the direction of motion of vibrating body 3. For smooth surfaces, coefficient of friction depends upon velocity4. Damping force depends upon the rubbing velocity between two rubbing surfaces

All the above statements are true

Which of the following statements is/are true for coulomb damping?1. C

1.	Which of the following statements is/are true for coulomb damping?1. Coulomb damping occurs due to friction between two lubricated surfaces2. Damping force is opposite to the direction of motion of vibrating body 3. For smooth surfaces, coefficient of friction depends upon velocity4. Damping force depends upon the rubbing velocity between two rubbing surfaces
A.	Only statement 1
B.	Statement 2, 3 and statement 4
C.	Only statement 2
D.	All the above statements are true
Answer» D. All the above statements are true

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