* Mass: Heavier objects tend to have lower natural frequencies. Imagine a heavy pendulum swinging – it moves slowly.

* Stiffness: Stiffer objects have higher natural frequencies. Think of a guitar string: a tighter string (stiffer) vibrates at a higher pitch.

* Shape and Geometry: The shape and distribution of mass influence how an object vibrates. A long, thin object will vibrate differently than a short, thick object.

* Material Properties: The material itself can affect the natural frequency. For example, a steel spring will vibrate differently than a rubber spring.

In summary: The natural frequency of an object is determined by its inherent physical properties. It's the frequency at which the object will vibrate most readily when disturbed.