http://www.bluefieldacademy.com/hand-target/
In tae-kwon-do, a hand is slammed down on a target at speed 13m/s and comes to stop during the 5 ms collision?
Assume that during the impact the hand is independent of the arm and has a mass 0.70kg. What are the magnitudes of the (a) impulse and (b) the average force on the hand from the target?
a) Impulse = F * t = m* (v) – m * (vo)^2,
but vo = 0, so
I =m * v, so I – 0.7 Kilograms * 13 meters per second
b) F = m * a = m * change in velocity / time
F (average) = 0.7 kg * 13 m / second / 0.005 seconds
target to hand
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