lecture18

# lecture18 - 1 Increases 2 Does not change 3 Decreases...

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Unformatted text preview: 1. Increases 2. Does not change 3. Decreases xample: Suppose rain falls vertically into an open cart rolling along a straight orizontal track with negligible friction. As a result of the accumulating water, the speed of the cart Mass is increasing P = mv must be conserved ( F ext = 0) Speed must decrease Ballistic Pendulum A simple device for measuring the speed of projectile M 1 U h ; 2 2 1 1 mv K gh m M U ) ( 3 m M ; 3 K ) ( ) ( 3 3 2 2 U K U K gh m M v M m ) ( 2 ) ( 2 2 gh m M m v 2 ) ( 1 1 , v m m M p 1 =mv 1 2. Immediately after collision: p 2 =(m+M)v 2 ; 2 ) ( 2 2 2 v M m K 2 U 1. Before collision: 3. At the highest point: p 3 =0 p 1 =p 2 mv 1 = (m+M)v 2 2 1 ) ( v m M m v 2 v h 1 m 1 m 2 h 2 2 2 1 1 1 1 v m gh m 1 1 2 gh v v m m v m ) ( 2 1 1 1 1 2 1 1 1 2 1 1 2 gh m m m v m m m v 2 2 1 2 2 1 2 gh m m v m m 1 2 2 1 1 2 2 2 h m m m g v h Example: p p’ p+p’ rubber p putty Example: You want to knock down a large bowling pin by throwing a ball at it. You can choose between two balls of equal mass and size. One is made of rubber and bounces back when it hits the pin. The other is made of putty and sticks to the pin. Which ball do you choose?...
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lecture18 - 1 Increases 2 Does not change 3 Decreases...

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