19lecture2a08

19lecture2a08 - Physics 2A Lecture 19: Feb 22 Vivek Sharma...

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Physics 2A Lecture 19: Feb 22 Vivek Sharma UCSD Physics
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Elastic Collision: K & p Are Conserved A V A1 B V B1 A V A2 B V B2 Usually masses and initial velocities are known. Final velocities obtained from 2 eq. and 2 unknowns 22 2 2 11 2 2 1 1 2 2 A AB B A A B B mv += + E conservation 2 2 AA BB + p conservation Next, consider some interesting situations
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Bambi Meets Godzilla & Vice Verca! 22 2 11 1 2 A AA BB mv =+ A substitute in mom-conserv. eq. to eliminat ( e ( ) an 2 ) d B B AB A A A A A A B B mm m vv v m v v v == + + + = 2 Rearrange: = () ( ) dividing 2 eqn A A A A A A A B A m v v m v v v v m v v v = = + + ⇒= Explain when m A << m B & m A >>m B
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Pool Table Physics: m A = m B and 2 AB A mm m vv == ++ Final Velocity & ; Striking ball stops & gives all its momentum & Kinetic energy b 0 ody at rest A B v = = In an elastic collision, relative velocity of the two bodies has the same magnitude before & after impact.
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Elastic Collision & Relative Velocity B A vv Vel. of B relative to A after collision = negative of vel. of B relative to A before collision same magnitude but opposite direction Relative velocity has before and after collision different In another Inertial Frame of Reference : A & B have velo relative velo cities but their is the city same From Energy & momentum conservation we obtained B A v = + v = 22 1 1 () BA B A v v −= −−
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Gravitational Slingshot Effect !
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This note was uploaded on 05/08/2008 for the course PHYS 2A taught by Professor Hicks during the Winter '07 term at UCSD.

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19lecture2a08 - Physics 2A Lecture 19: Feb 22 Vivek Sharma...

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