Practice Surface Tension (4.6) - Fluid Flow Through Parallel Plates - Fluid Mechanics

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6 sample questions

Question 1.
Define surface tension.
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Think about the forces at the surface of a liquid.
Question 2.
What are cohesive forces?
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Consider why water droplets stay together.
3Question 3.
What acts as the main force creating surface tension?
- Adhesive Forces
- Cohesive Forces
- Gravitational Forces
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Think about the forces that hold liquid molecules together.
4Question 4.
Surface tension increases with temperature. True or False?
- True
- False
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Consider the effect of heating on molecules.
Question 5.
A water droplet has a radius of 2 mm. Calculate the surface tension force acting on the droplet if the liquid's surface tension is 0.072 N/m. Use the formula f = surface_tension * circumference.
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Don't forget to calculate the circumference first!
Question 6.
If the surface tension of mercury is 0.485 N/m, what is the pressure difference across a mercury drop with a radius of 5 mm?
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Use the surface tension relation formula.

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