Momentum & its conservation
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Transcript of Momentum & its conservation
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Momentum & its conservation
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Fc Ft
Fc = mc change in vc time
Fc time = mc change in vc
Ft = mt change in vt time
Ft time = mt change in vt
Fc time + Ft time = mc change in vc + mt change in vt
(Fc + Ft)time =change in mcvc + change in mtvt
Car truck collision
(Fc + Ft)time =change in (mcvc + mtvt)
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Fc Ft
Car truck collision
(Fc + Ft)time =change in (mcvc + mtvt)
Newton’s 3rd law: Fc = -Ft (Fc + Ft)time = 0
0 = change in (mcvc + mtvt)
mcvc + mtvt stays constant!
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Momentum = mvmcvc = momentum of car
Mtvt= momentum of thruck
mcvc + mtvt = total momentum
this changesthis changes
this stays constant
Momentum is conserved!
Before = -40
After = -40
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True for all collisions
before =+20
after =+20
visit www.physicsclassroom.com/mmedia/index.html
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Revisit the canoe at the dockInitial momentumcanoe = 0boy = 0Total = 0
final momentumcanoe = mcvcboy = mbvbTotal = 0
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Momentum is a vector: mvcollision in 2 dimensions
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Finding nemoeating
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Billiard balls
2before
1ptot 1
2
afterptot
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Conservation of momentumon a sub-atomic level
- meson- meson
proton
p
p
before
after
ptot
ptot
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Rocket travel
before
P0
after
P0 + pexhaust
p
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Rifle recoil
mVmV
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Machine-gun granny