Lecture 12a

Lecture 12a - PHYSICS 220 Lecture 12 Collision and...

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PHYSICS 220 Lecture 12 Collision and Explosion Lecture 12 1
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Collision Example Lecture 12 2 A freight train is being assembled in switching yard. Car 1 has a mass of m 1 =65 x 10 3 kg and moves at a velocity v 01 =0.80 m/s. Car 2 has a mass of m 2 =92 x 10 3 kg and moves at a velocity v 02 =1.3 m/s and couples to Car 1. Neglecting friction, find the common velocity v f of the cars after they become coupled. m 2 m 1 v 02 v 01 initial m 2 m 1 v f final
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Example Lecture 12 3 Conservation of momentum P f = P i P i = m 1 v o 1 + m 2 v 02 P f = ( m 1 + m 2 ) v f ( m 1 + m 2 ) v f = m 1 v o 1 + m 2 v 02 v f = m 1 v 01 + m 2 v 02 m 1 + m 2 v f = (65 × 10 3 kg )(0.8 m s ) + (92 × 10 3 kg )(1.3 m s ) (65 × 10 3 kg + 92 × 10 3 kg ) = 1.1 m s A freight train is being assembled in switching yard. Car 1 has a mass of m 1 =65 x 10 3 kg and moves at a velocity v 01 =0.80 m/s. Car 2 has a mass of m 2 =92 x 10 3 kg and moves at a velocity v 02 =1.3 m/s and couples to Car 1. Neglecting friction, find the common velocity v f of the cars after they become coupled.
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Center of Mass Lecture 12 4 Suppose we want to describe the motions of these galaxies Each galaxy may have > 10 12 stars Can we understand the motion of each galaxy without analyzing the motion of each star?
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Lecture 12a - PHYSICS 220 Lecture 12 Collision and...

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