# Damping of oil in a U-shaped tube

#1
Could someone help answer this question from the AQA A-level Year 2 Physics Oxford text book:
"State whether the damping in each of the following examples is light, critical or heavy:
ii. oil in a U-shaped tube displaced from equilibrium the released"
The book says that the answer is heavy however I do not understand why this is, oil has minimal friction so surely the damping would be light?
0
4 years ago
#2
...
A pendulum swinging through air, or even displaced water, is far less damped than a displaced region (of higher density) of oil.

Motion in oil is heavily resisted due to its high viscosity, so you could re-label 'friction' here.

Note there are 4 main types of friction: static, sliding, rolling, fluid. Resistance will do.
0
4 years ago
#3
Could someone help answer this question from the AQA A-level Year 2 Physics Oxford text book:
"State whether the damping in each of the following examples is light, critical or heavy:
ii. oil in a U-shaped tube displaced from equilibrium the released"
The book says that the answer is heavy however I do not understand why this is, oil has minimal friction so surely the damping would be light?

I suspect you are confused with something – oil can help to reduce friction between two solid surfaces but it does not flow smoothly which is a property known as viscosity.

https://physics.info/viscosity/

https://en.wikipedia.org/wiki/Viscosity

If you compare the viscosity value for oil and water (from the above websites), you would realize that water has a much smaller value than that of oil

From your daily experience, you should be able to come to realize that oil tends to flow slower than water.
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