Fluid mechanics
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7 Terms
define fluid mechanics
forces acting upon body travelling through air/water
define drag
force that opposes direction of motion through water/air
factors affecting drag
velocity
front cross-sectional area
shape
surface characteristics
describe how velocity affects drag + give an example
greater velocity = greater drag
e.g. swimmers have high drag due to their high velocity
describe how front cross-sectional area affects drag + give an example
greater front cross-sectional area = greater drag
e.g. low crouched position of downhill skier decreases drag
describe how shape affects drag + give an example
more aerodynamic/streamlined = less drag
e.g. streamlined body shape out of tumble turn in swimming decreases drag
describe how surface characteristics affect drag + give an example
smoother surface = lower drag
e.g. specially designed swimming suits to minimise drag
