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13-relative motion 3

# 13-relative motion 3 - PHYS 211 2D and 3D Motion Describe...

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PHYS 211 2/ 13 /09 2D and 3D Motion Describe: Relative Motion Next Week: Chapters 5,6 Force and Motion Newton’s Laws

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Test 1 Results are Posted !"!! !"\$! !"%! !"&! !"’! ("!! ("\$! ( (! () \$’ *+ %& ,, &% +* ’\$ )( (!! (!) ((’ (\$+ (*& (%, (,% (&* (+\$ (’( ()! ()) Score: Points Correct/57 Average: 72 Score Score See syllabus (BlackBoard) for course grade formula
Displacement, Velocity, Acceleration Which one of the following quantities is the change in object’s velocity divided by the elapsed time as the elapsed time becomes very small? a) average velocity b) instantaneous velocity c) average displacement d) average acceleration e) instantaneous acceleration

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Relative Motion - 1D (disp) Reference frames are related to each other. Physics described must be the same, no matter which frame you use. X BA - position of B relative to A X PB - position of P relative to B X PA - position of P relative to A x PA = x PB + x BA Notice order of subscripts inner ones the same outer ones (on right) match left side
Relative Motion - 1D (acc) x PA = x PB + x BA v PA = v PB + v BA For inertial frames , v BA =constant, so a BA =0 a PA = a PB + a BA a PA = a PB same acceleration!

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13-relative motion 3 - PHYS 211 2D and 3D Motion Describe...

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