Here's why:

* Restoring Force: Both a rubber band and elastic force act as a restoring force. When you stretch a rubber band or compress an elastic material, they resist the deformation and try to return to their original shape.

* Proportional to Displacement: The force exerted by a rubber band (and elastic force in general) is proportional to how much it is stretched or compressed. This is known as Hooke's Law. The more you stretch it, the stronger the force pulling it back.

* Energy Storage: Both rubber bands and elastic materials store energy when stretched or compressed. This stored energy is released as the material returns to its original state.

Examples of Elastic Force:

* Springs: Springs are classic examples of elastic force. They are designed to store and release energy.

* Bungee Cords: These are essentially long, thick rubber bands used for jumping.

* Rubber Tires: The elastic force in tires helps absorb shocks and provide a smooth ride.

Let me know if you have any other questions!