A drop of water clings to a window pane, held there by forces between unlike molecules. What are those forces called?
ACohesive forces
BBuoyant forces
CShearing forces
DAdhesive forces
Answer & Solution
Correct answer: D. Adhesive forces
1. The drop and the pane are made of different substances, so the attraction is between unlike molecules.
2. Attractive forces between molecules of different types are adhesive forces.
3. Such forces are exactly what makes liquid drops cling to window panes.
4. Cohesive forces act between like molecules and hold the drop together internally rather than fixing it to the glass.
_Source: OpenStax College Physics (CC BY 4.0), Ch 11 "Fluid Statics", section 11.8 Cohesion and Adhesion in Liquids: Surface Tension and Capillary Action_
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