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What three factors affect the amount of air resistance from the force of gravity?
Wiki User
∙ 12y ago
(Forces in newtons)
The (constant) force down on a freefalling body is : mass (kg) * acceleration due to gravity ((m/s)/s) .
The force of air resistance up is : velocity2 * drag coefficient .
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The net force is the difference between the two .
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Acceleration at any given velocity is given by net force / mass .
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Terminal velocity is where the down and upforces balance .
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Drag coefficient can be calculated if terminal velocity, mass and acceleration due to gravity (g) are known.
Example:
Terminal velocity = 70 m/s, Mass = 70 kg, g = 9.82 (m/s)/s
Then >
force down = 70 * 9.82 = 687.4 newtons
forces are equal at terminal velocity so air resistance = 687.4 newtons @ 70 m/s
So >
687.4 = v2 * drag coefficient
So >
drag coefficient = 687.4 / v2 = 0.14 (approx) .
Wiki User
∙ 12y ago
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