Give two examples of reversible processes and two examples...

Give two examples of reversible processes and two examples of irreversible processes in mechanical system. These can be bricks that slip on a surface, springs, pistons, pendulums, strings ... etc. Explain what makes the process reversible or irreversible.

Transcript

00:01 Hello everyone.

00:02 So the first one is the reversible.

00:05 Okay.

00:07 So the height, the frictionless pulley with a string passing over it and two almost equal masses, that is 1m and 2m, okay, suspended from the two ends of a string 1 meter, descends if it is slightly heavier than 2 meter, if it is slightly heavier than 2 meter, okay, then 2 meter, right? and ascends if 2 meter is slightly heavier.

00:40 Okay, it would descend if 1 meter descends if it is slightly heavier.

00:51 If it is slightly heavier, that is having more mass, okay? that is having more mass and ascends if 2 meter is slightly heavier.

01:03 It would ascend if two meters, if it is having less mass, right? now see, i hope this just made it clear.

01:14 Okay, a small change in one of the masses causes the system to move in the opposite direction.

01:20 Okay.

01:21 Now, a block on the, a block on the horizontal frictionless surface.

01:27 The surface is not having friction.

01:29 It is perfectly smooth.

01:31 Okay.

01:31 And attached to one end of a spring the block is pushed against the spring and it compresses it then the applied force is kept almost equal in magnitude to the spring force if the applied force that is force applied okay is increased slightly it increases slightly then the block moves one direction and if the applied force is decreased then slightly of course then the block moves back to the other direction okay now seeing the second part that is the irreversible one so in the irreversible one the first one we are seeing a bullet is fired through a block of wood that is initially at rest on a horizontal frictionless surface okay bullet has has been fired.

02:28 The bullet passes through the block.

02:30 The bullet will pass through the block...

Question

Give two examples of reversible processes and two examples of irreversible processes in mechanical system. These can be bricks that slip on a surface, springs, pistons, pendulums, strings ... etc. Explain what makes the process reversible or irreversible.

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