Question

the attraction that causes water droplets to stick together and form larger drops when dropped on a penny is called...
adhesion
cohesion
capillary action
surface tension

Explanation:

To solve this, we analyze each term:

• Adhesion: Attraction between different substances (e.g., water and a penny).
• Cohesion: Attraction between molecules of the same substance (water molecules sticking to each other, forming larger drops).
• Capillary action: Movement of liquid in narrow spaces (e.g., water rising in a straw), not about droplets sticking together.
• Surface tension: Result of cohesion at the surface, but the question focuses on droplets sticking together (cohesion is the direct attraction here).

Since the question is about water droplets (same substance) sticking together, cohesion is the correct term.

Answer:

B. cohesion