Question

when friction reduces the mechanical energy of the system in shm as time passes the motion is said to be (a) simple (b) damped (c) random (d) linear

Answer 1

.

Asuming friction is quite small, so the oscillations continue but aplotide gradually reduces, damped would be the best choice.To derive the damped oscillations you should note a salient point that friction will always oppose the velocity in direction and you could assume it to be more or less constant in magnitude till the pendulum continues to move.

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Answer 2

The correct option to the following question is (c).

• when friction reduces the mechanical energy of the system in SHM as time passes the motion is said to be damped.
• The system involves elastic potential energy as the spring compresses and expands, the friction that is related to the work done, and the kinetic energy as the body speeds up and slows down.
• The energy is not conserved in damped simple harmonic motion.
• When friction is there, it reduces the energy of the simple harmonic motion, and so the SHM is said to be damped.
• Friction is the hinderance to any motion.