Two blocks of masses m 1 and m 2 are connected with a massl…

Physics Friction General MCQ (Single Correct)

Two blocks of masses m 1 and m 2 are connected with a massless undeformed spring and placed over a plank moving with an acceleration ‘a’ as shown in figure. The coefficient of friction between the blocks and platform is µ.

spring will be stretched if a > µg

spring will be compressed if a

µg

spring will neither be compressed nor be stretched only if a

µ g

spring will be in its natural length under all conditions only if initial velocities of blocks are same

Text Solution

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The correct answer is:

Let the value of ‘a’ be increased from zero. As long as a µg, there shall be no relative

motion between m 1 or m 2 and platform, that is, m 1 and m 2 shall move with acceleration a.

As a > µg the acceleration of m 1 and m 2 shall become µg each.

Hence at all instants the velocity of m 1 and m 2 shall be same

The spring shall always remain in natural length.

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