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Grade: 11

                        

Two disks are connected by a stiff spring. Can you press the upper disk down enough so that when it is released it will spring back and raise the lower disk off the table (see Fig. 12-12)? Can mechanical energy be conserved in such a case?

5 years ago

Answers : (1)

Aditi Chauhan
askIITians Faculty
396 Points
							Yes, you can press the upper disk down enough so that when it is released it will spring back and raise the lower disk off the table. When the upper disk is released after pressing it, the kinetic energy of the upper disk will increase results the decrease of kinetic energy in the lower disk. Therefore the upper disk will spring back and raise the lower disk off the table.
Yes, the mechanical energy can be conserved in such a case. In accordance with the law of conservation of mechanical energy, in an isolated system in which only conservative forces act, the total mechanical energy remains constant. Since there is no external force acting on the system, therefore the total mechanical energy of the system will be conserved.
5 years ago
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