# 8.21 The Physics of Energy Fall 2009 For information about

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Air Resistance and Friction 3. Air Resistance and Friction How much energy is lost to air resistance? A Car collides with air molecules, sweeps into wake Details complicated–But basic idea is simple: Car sweeps out tube of area A, accelerates air to ˘v =E air ˘1 2 c d( m air)v2 c d = drag coefﬁcient (typical car: c d ˘1=3) dE air dt ...

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8.21 The Physics of Energy Fall 2009 For information about ...
Air Resistance and Friction 3. Air Resistance and Friction How much energy is lost to air resistance? A Car collides with air molecules, sweeps into wake Details complicated–But basic idea is simple: Car sweeps out tube of area A, accelerates air to ˘v =E air ˘1 2 c d( m air)v2 c d = drag coefﬁcient (typical car: c d ˘1=3) dE air dt ...
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