- #1
yasar1967
- 73
- 0
When you punch someone in the face and leave your hand there, it'll be less effective than doing a strike where contact time is kept minimal: hit and back.
The reason is the conservation of linear momentum and impulse.
In the first case:
(As the force-average is the change in the momentum of system(hand+face) divided by
Δt)
F=(Pfinal - Pinitial)/Δt=(0-Pinitial)/Δt=-Pinitial/Δt
[P hereby refers to the initial and final momentum of hand and therefore minus sign becomes + when subtraction is carried out as the direction of the speed changes]
In the second case:
F=(Pfinal - Pinitial)/Δt
so anything added to the Pfinal will increase the Force applied to face by also keeping the time minimal.
Am I correct?
The reason is the conservation of linear momentum and impulse.
In the first case:
(As the force-average is the change in the momentum of system(hand+face) divided by
Δt)
F=(Pfinal - Pinitial)/Δt=(0-Pinitial)/Δt=-Pinitial/Δt
[P hereby refers to the initial and final momentum of hand and therefore minus sign becomes + when subtraction is carried out as the direction of the speed changes]
In the second case:
F=(Pfinal - Pinitial)/Δt
so anything added to the Pfinal will increase the Force applied to face by also keeping the time minimal.
Am I correct?