How is if you pushed a shopping cart and one wheel hit a rough piece concrete it is difficult to steer the cart in a straight line similar to refraction of a wave as it enters a new medium?

When a shopping cart wheel hits a rough piece of concrete, it causes the wheel to deviate from its original path, similar to how light waves bend when they enter a new medium with a different density. This deviation is due to the change in speed and direction caused by the interaction between the wheel or wave and the new medium's surface or properties. Both scenariOS show how contact with a new medium or surface can alter the direction of motion.