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"~y~ CJ DA /I conservation problems are solved using: pinitio,! = pfinal

. 1rU-(r CPo'- r-f\Exampie Proble~!:' L..:t;::..I fvv~ "- .

. A 12qO.kg:car is stopped a~ a traffic light when a 3500 kg truck mo~ing at 8.4 'm/s hits, it from behind. If the bumpers lock, how fast will the' two vehicles move?rc,t4r -+ t+•..u e l'. ~ fkth.

o + '1SO" 0 k..<y' 8,1r {l\IS = ~::j-oo K.~. 'IJ ItV-= ".3 (\'\151A 0.'0050 kg bullet is fired at a velocity of .~20 .m/s from a 2.0 kg gun. What isthe recoil velocity of the gun?

~lOLfi&l\ =: ff"a.\ . ",'c " . 0 ': D· 005 • 32.0 N\(S + 3.'l (-'V')

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Use the impulse equation to answer:Which as greater?

(car, bu ,or =) State our reason here.

Force -the. vrr\ -m et tiMe i s ~ Sttm eF, t- -;:.lrn.rv ( ~eImpulse,

Time ----

Change in Momentum --Mass

Change in Velocity bu~ (

Show Wnat You Know: 1-5 (on back) . bt~' ftJ m~fS. ft<.:ePHYSICSFundamentals is '5 m ~ ((.e

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mt ~ b5Kiftf\l ~ 12 ~'\J).. -;:2 .2.. (l) (5 ~~~re kfkr

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f(\\ &( :: ('\\11)'-2-."'. (\~ ~I\ 1]-2-

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Transparency: Show What You Know, Episode 602

1) A collision in which the objects stick together or aredeformed is...a. elastic. . inelastic.

2) The only perfectly elastic collision is between ...a. billiard balls.b. bumper cars.

@gas molecules.d. none of these.

3) Momentum is...a. conserved in elastic collisions only.b. conserved in inelastic collisions only.c. conserved in explosions only.

@conserved in all collisions and explosions.

4) A gun will kick with less velocity if the mass of the gunis...@.increased.b. decreased.c. neither I because mass does not effect momentum.

5) When a ball and bat collide, the ball experiences thegreater ...a. force.b. impulse.c. change in momentum.

@)change in velocity.PHYSICSFu ndamenta Is

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