Physics 2210 Fall Semester 2014belz/phys2210/lecture18.pdf9.7 kg and radius R 023 m is rotating with...

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Lecture 18: Angular Momentum Physics 2210 Fall Semester 2014

Transcript of Physics 2210 Fall Semester 2014belz/phys2210/lecture18.pdf9.7 kg and radius R 023 m is rotating with...

Page 1: Physics 2210 Fall Semester 2014belz/phys2210/lecture18.pdf9.7 kg and radius R 023 m is rotating with a constant angular = 37 rad's. A thin rectangular rod with mass m2 = 3.7 kg and

Lecture 18: Angular Momentum

Physics 2210Fall Semester 2014

Page 2: Physics 2210 Fall Semester 2014belz/phys2210/lecture18.pdf9.7 kg and radius R 023 m is rotating with a constant angular = 37 rad's. A thin rectangular rod with mass m2 = 3.7 kg and

Prelecture Feedback

● This seems fairly straightforward, unless I'm kidding myself.

● I don't understand how objects moving in a straight line have angular momentum.

● Last two checkpoint problems● Transition from linear to rotational dynamics

different... more examples would be useful.● More momentum conservation, more

homework-like problems.

Page 3: Physics 2210 Fall Semester 2014belz/phys2210/lecture18.pdf9.7 kg and radius R 023 m is rotating with a constant angular = 37 rad's. A thin rectangular rod with mass m2 = 3.7 kg and

1D Translational and Rotational motion

Mechanics Lecture 18, Slide 3

Missing piece: Momentum

Page 4: Physics 2210 Fall Semester 2014belz/phys2210/lecture18.pdf9.7 kg and radius R 023 m is rotating with a constant angular = 37 rad's. A thin rectangular rod with mass m2 = 3.7 kg and
Page 5: Physics 2210 Fall Semester 2014belz/phys2210/lecture18.pdf9.7 kg and radius R 023 m is rotating with a constant angular = 37 rad's. A thin rectangular rod with mass m2 = 3.7 kg and
Page 6: Physics 2210 Fall Semester 2014belz/phys2210/lecture18.pdf9.7 kg and radius R 023 m is rotating with a constant angular = 37 rad's. A thin rectangular rod with mass m2 = 3.7 kg and
Page 7: Physics 2210 Fall Semester 2014belz/phys2210/lecture18.pdf9.7 kg and radius R 023 m is rotating with a constant angular = 37 rad's. A thin rectangular rod with mass m2 = 3.7 kg and

Checkpoint 2

Page 8: Physics 2210 Fall Semester 2014belz/phys2210/lecture18.pdf9.7 kg and radius R 023 m is rotating with a constant angular = 37 rad's. A thin rectangular rod with mass m2 = 3.7 kg and

Checkpoint 2

Page 9: Physics 2210 Fall Semester 2014belz/phys2210/lecture18.pdf9.7 kg and radius R 023 m is rotating with a constant angular = 37 rad's. A thin rectangular rod with mass m2 = 3.7 kg and

Checkpoint 3

Page 10: Physics 2210 Fall Semester 2014belz/phys2210/lecture18.pdf9.7 kg and radius R 023 m is rotating with a constant angular = 37 rad's. A thin rectangular rod with mass m2 = 3.7 kg and

Checkpoint 3

Page 11: Physics 2210 Fall Semester 2014belz/phys2210/lecture18.pdf9.7 kg and radius R 023 m is rotating with a constant angular = 37 rad's. A thin rectangular rod with mass m2 = 3.7 kg and

Mechanics Lecture 18, Slide 11

Flashcard Question

2

Page 12: Physics 2210 Fall Semester 2014belz/phys2210/lecture18.pdf9.7 kg and radius R 023 m is rotating with a constant angular = 37 rad's. A thin rectangular rod with mass m2 = 3.7 kg and

Mechanics Lecture 18, Slide 12

Flashcard Question

Page 13: Physics 2210 Fall Semester 2014belz/phys2210/lecture18.pdf9.7 kg and radius R 023 m is rotating with a constant angular = 37 rad's. A thin rectangular rod with mass m2 = 3.7 kg and

Homework 1

Page 14: Physics 2210 Fall Semester 2014belz/phys2210/lecture18.pdf9.7 kg and radius R 023 m is rotating with a constant angular = 37 rad's. A thin rectangular rod with mass m2 = 3.7 kg and
Page 15: Physics 2210 Fall Semester 2014belz/phys2210/lecture18.pdf9.7 kg and radius R 023 m is rotating with a constant angular = 37 rad's. A thin rectangular rod with mass m2 = 3.7 kg and

Homework 2

● What is initial angular momentum of rod/disk system?● What is initial rotational energy of system?● What is final angular velocity of the disk?● What is final angular velocity of the rod/disk system?● If it took the rod 6.4 sec to accelerate to its final angular speed,

what was average torque exerted by the disk?

Page 16: Physics 2210 Fall Semester 2014belz/phys2210/lecture18.pdf9.7 kg and radius R 023 m is rotating with a constant angular = 37 rad's. A thin rectangular rod with mass m2 = 3.7 kg and

Homework 3

● What is the total moment of inertia of the system?● What is the total moment of inertia at the system at the

final position?● What is the final angular velocity?● What is the change in total kinetic energy?● What is the centripetal acceleration of the person at R/3?● If the person walks back to the edge of the disk, what is the

final angular velocity of the disk?


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