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Reply #18: It's all in the details, unfortunately [View All]

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BrewerJohn Donating Member (499 posts) Send PM | Profile | Ignore Mon Nov-24-03 10:13 PM
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18. It's all in the details, unfortunately
Force is the rate of change of momentum (of the impacting animal), so the force vs. time curve during the collision depends on the details of the collision, which are probably unpredictable. You can estimate an average force over the collision time, though, by estimating the total time the animal is in contact with you, and knowing whether it bounces off (and how fast) or just falls at your feet.

For example, if it hits you and then falls flat, the total momentum change is about (54.5 kg) X (26.8 meters/sec) (those being the metric equivalents of 120 pounds and 60 mph) = 1461 kg-m/s. If this happens over 0.1 second the average force is (1461 kg-m/s)/(0.1 s) = 14,610 kg-m/s^2 (or newtons), which converts to around 3285 pounds of force.
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