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Unformatted text preview: PHYSICS: A World View Thursday, 3 March 2005 READ Ch 7 (pp 119130 ); PS 7: 13 PRAC Ch 6: Q 19, 23, 25; E 15, 19; P 11, 17 HW #14 Ch 6: Q 20, 28, 38; E 12 Tu 8 Mar LAB #19 Black Box Pre = 2 My promise to you: Always include everything that bumps in your system. The impulse on your system will then be zero. p i + Impulse ext = p f My promise to you: Always include everything that bumps in your system. The impulse on your system will then be zero. p i = p f My promise to you: Always include everything that bumps in your system. The impulse on your system will then be zero. p i (system) = p f (system) World Series of Poker Buy in at $10,000; 50 players; $0.5 million Total amount of money on table stays the same even though what each player has varies. Water Put water into a sealed plastic bag Freeze the water Is anything invariant? Not volume Number of molecules Mass Example: A boxcar traveling at 10 m/s approaches a string of 4 identical boxcars sitting stationary on the track. The moving boxcar collides and links with the stationary cars and the five move off together along the track. What is the final speed of the five cars immediately after the collision? (You may take the mass of each boxcar to be 18537 kg.) Example: v i = 10 m/s v f = ? m car = 18,537 kg Momentum is conserved during a collision Total momentum for the system adds up to zero before and after the collision. Total momentum for the system stays the same before and after the collision. What does this mean? Example (with a twist): A boxcar traveling at 10 m/s approaches a string of 4 identical boxcars sitting stationary on the track....
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 Fall '02
 GregoryFrancis

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