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Transcript of Rugby Impulse
(97kg)(-10m/s) + (85kg)(4m/s) = 182 vf
-3.46 = vf Now on to Impulse The Impulse Equation is I = mvf - mvi
(97)(-3.46) - (97)(-10) = 634.2 kgm/s Using I= F T, I know that average force is
I/ T 634.2 kgm/s | .57 = 1112.6 N 1112.6 N is the force behind this tackle. Wowza! This is the same magnitude for both players. This is due to Newtons Third Law. Rugby Penalty Kick This kick, taken by Leigh Halfpenny of Wales, traveled 52 meters horizontally in 3.98 seconds. A Penalty kick is taken from a tee, at distances ranging from 22, to 65 meters from the goal posts. The Kick The Details Behind the Kick The Ball, weighs .46 Kg The Ball travels 52 meters, in 3.98 seconds, The time of impact is .07 seconds The Science Behind the Kick V= Vi + AT
At the top of the arc, the VY is 0
And the time will be half of the total time. 0= VY + (-9.8) T/2
VY= 9.8 * 3.98/2 VY= 4.9 (3.98) VY= 19.502 M/S The Science Behind the Horizontal Vx = D/T Vx = 52 / 3.98 Vx = 13.07 M/S Total Velocity A^2 + B^2 = C^2 19.502^2 + 13.07^2 = C^2
551.2 = C^2
23.48 = C C is Velocity in M/S Impulse of the Kick I= Mvf - Mvi I = .46(23.48) - .46(0) I = 10.8 KgM/S F= I/ t F= 10.8/ .07 F= 154.3 N http://www.worldacademicunion.com/journal/SSCI/SSCIvol06no02paper03.pdf http://entertainment.howstuffworks.com/physics-of-football4.htm http://www.unc.edu/~ahaftman/PHYS%20EC/PHYS%20EC/Physics%20of%20a%20Rugby%20Tackle.html