Why do balloons filled with air pop on grass?

Balloons filled with air pop on grass primarily due to friction and sharp objects. When a balloon lands on grass, the blades may create small punctures or contribute to wear on the balloon's surface. Additionally, if the grass is dry or has sharp edges, it can create enough pressure to exceed the balloon's tensile strength, causing it to burst. The combination of these factors leads to a higher likelihood of popping compared to landing on softer surfaces.