Fluid mechanics

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10 Terms

1
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What is fluid mechanics?

study of the forces acting on a body travelling through the air or water

2
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Air resistance definition

force that opposes the direction of motion of a body through the air

3
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Factors affecting air resistance and drag

velocity
front cross sectional area
streamlining and shape
surface characteristics

4
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Drag definition

force that opposes DOM of a body through water

5
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Velocity affecting AR and drag

big velocity, big AR/drag

6
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Front cross sectional area affecting AR and drag

big area, big AR/drag
minimise, eg. a cyclist tucking in body

7
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Streamlining and shape affecting AR/drag

more streamlined shape of body, lower AR/drag

8
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What is streamlining?

creating smooth air flow around an aerodynamic shape

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Aerofoil shape

tear drop design to be more aerodynamic
shape with curved upper surface and flat lower

10
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Surface characteristics affecting AR/drag

smoother surface, lower AR/drag
eg. lycra in cycling