Answer:
1. the two surfaces can pull off each other
2. because anyone can slip and get hurt
Explanation:
1. When two surfaces slide over one another the tiny bumps push on each other. Friction causes a force on a surface which is in the opposite direction to its motion. Friction can be reduced by the application of lubricants
2. safety is the number one priority when it comes to dangerous places such as swimming pools, beaches etc.
