Give examples of shim in which elastic constants are not involved.

Explanation

To answer the question regarding examples of systems in which elastic constants are not involved, we need to understand what is meant by "SIM" (Simple Harmonic Motion) and the role of elastic constants in oscillatory systems.

### Step-by-Step Solution:

1. **Understanding Simple Harmonic Motion (SHM)**:
- SHM is a type of periodic motion where the restoring force is directly proportional to the displacement from the equilibrium position and acts in the opposite direction.
- Elastic constants (like spring constant, k) are often involved in systems that exhibit SHM, but there are other systems that can oscillate without relying on these constants.

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