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P1 CIE physics doubts

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sweetie:

--- Quote from: ~ A.F ~ on April 25, 2010, 07:44:02 pm ---PS; I haven't got the answers..soc heck'em pls :) :

Q.10: v1-v2/u2+u1=1

therefore u1+u2=v2-v1------> D

Q.11:

You must write down the equations for both objects:

1) box-----> T-6= 2a----> T=28+6
2) 2 KG---> 2g-T=2a----> T=2g-2a

now we got 2 Ts equations:

8a+6=2g-2a

10a= 2g-6

a= 1.4---->A

Hope you got that :D


--- End quote ---

for Q10 , arent v1 and v2 moving in same direction , so their signs should be the same , nd the signs of u1 and u2 should be diff.????

~ A.F ~:
lol no..

there's that thing called coefficient of restitution, e,=

e= v1+- v2/u1+-u2

sign is positive when directions are similar..e=1 when collision is PERFECTLY elastic :)

astarmathsandphysics:
For restitution
If moving in same direction closing speed or parting speed = bigger speed - smaller spedd
If movin towards each other clsong spped =sum of speeds

astarmathsandphysics:
And if they are moving apart separation speed = sum of speeds

sweetie:
ok ppl,
cn sum1 xplain Q32 as well nd Q11 and 10 too  ( am not gettin them :-[)
Thank You

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