What force makes the wet slides more difficult to separate than dry slides?
A cohesion
B repulsion
C adhesion
D gravity
The Correct Answer and Explanation is:
The correct answer is C) adhesion.
Explanation:
When two wet slides are placed together, the force that makes them more difficult to separate than dry slides is adhesion. Adhesion refers to the attractive force between molecules of different substances, in this case, the water molecules and the surface of the slides.
In the context of wet slides, when water is present between the surfaces of the slides, the water molecules adhere to the glass surfaces, creating a bond between them. This bond makes it harder to pull the slides apart because the water molecules create a film that essentially “glues” the two slides together. The stronger the adhesive force between the water molecules and the glass, the more difficult it is to separate the slides.
If the slides were dry, the absence of water would mean there is no adhesive force between the surfaces, and the slides would be easier to separate. The force responsible for sticking the slides together is adhesion, not cohesion. Cohesion, in contrast, refers to the attraction between like molecules, such as the attraction between water molecules themselves. While cohesion plays a role in the surface tension of water, it is adhesion that directly affects the difficulty of separating the slides.
In addition, repulsion (option B) refers to the force that pushes objects apart, and gravity (option D) affects the weight of the slides but does not directly influence their difficulty to separate. Therefore, adhesion is the primary force that causes the slides to stick together when wet.
In summary, adhesion is the force that makes the wet slides more difficult to separate than dry slides because water molecules adhere to the glass surfaces, creating a bond that resists separation.