Carla makes a small cardboard boat and floats it in a tub of water. When she adds a drop of dish soap behind the boat, the boat moves forward.
Which statement best explains what happened?
The soap increased the viscosity of the water behind the boat, allowing the water in front of the boat to flow more easily.
The soap reduced the surface tension behind the boat, causing both water molecules and the boat to be pulled forward.
The soap increased the kinetic energy of the water molecules behind the boat, causing both the molecules and the boat to move forward.
The soap formed an immiscible layer on the water, causing the soap to spread out and push the boat forward.
Answers
Answer:
Answer is 2nd .
Explanation:
The soaps has a property that they decrease surface tension of water.
The statement that best explains the happened incident is,the soap reduced the surface tension behind the boat, causing both water molecules and the boat to be pulled forward.
• The cardboard boat actually floats on the outermost thin surface tension layer of the water.
• Now,the soap molecules have fat contents and these fat contents are able to break the thin surface tension layer of the water.
• After the surface tension layer got broken,the cardboard boat moves away with the broken segments of the surface tension layer. (These broken segments of the surface tension layers obtain a random motion away from the point where the soap was dissolved)