Practice Numerical Experiments (17.3.2) - Drag and Lift - Fluid Mechanics

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6 sample questions

Question 1.
Define drag force in fluid mechanics.
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Think about what a fluid does when an object moves through it.
Question 2.
What factor influences the coefficient of drag?
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Remember the effects of different shapes in nature.
3Question 3.
What is drag force?
- A force opposite to motion
- A force enabling rise
- A static force
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Consider what happens when something moves through a medium.
4Question 4.
True or False: Lift forces act perpendicular to the motion of an object.
- True
- False
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Think about how birds take off.
Question 5.
A 10kg object falls through air with a drag coefficient of 0.8. If the terminal velocity is achieved at a speed of 50 m/s, calculate the buoyant force acting on it.
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Start by calculating the weight of the object and relate it to drag.
Question 6.
Analyze how altering the shape of a vehicle could decrease drag forces encountered while in motion at high speeds.
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Think about why sports cars and airplanes have their specific designs.

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