ShmoopTube

Where Monty Python meets your 10th grade teacher.

Search Thousands of Shmoop Videos

AP Physics 1: 3.5 Changes and Conservation Laws 177 Views


Share It!


Description:

AP Physics 1: 3.5 Changes and Conservation Laws. Which of the following would increase the rate at which the plate spins?

Language:
English Language

Transcript

00:00

Thank you We sneak and here's your shmoop du jour

00:05

Brought to you by spinning plates Watching people spin plates

00:08

actually is to be a popular form of entertainment Don't

00:11

ask us what Alright check out following diagram this thing

00:14

spinning plate right there A glass plate of mass and

00:17

radius are there is spinning on top of a pole

00:21

has shown all right Which of the following would increase

00:24

the rate at which the plates spin Select two here

00:27

in the aisle All right well let's see we're dealing

00:31

with something That's turning huh That must mean we're dealing

00:34

with angular momenta ding ding because we're geniuses We know

00:38

that angular momentum equals mass times velocity times the objects

00:41

radius or we just got a clever too one day

00:44

And because we're super geniuses we know that momentum is

00:47

conserved whether that's angular momentum or linear momentum So once

00:52

forces applied and objects total momentum won't change unless another

00:57

force acts on it So if momentum doesn't change we

01:00

know that if we want to raise velocity we have

01:02

tto lower one of the other variables That means we

01:05

can decrease the mass of the plate or decrease the

01:07

radius of the plate We'll do it Either it is

01:10

or both would mean that the velocity would have to

01:12

increase to maintain a total angular momenta So are correct

01:16

choices are a and c and looking at our equation

01:19

we can see that the length of the pool doesn't

01:20

affect angular momentum so be doesn't work and placing a

01:24

small way that the edge of the plate would increase

01:26

mass was it would throw off the delicate balance of

01:29

the plate and well ruin the whole act You don't

01:31

even wanna think about Answer date Speaking of super genius

01:34

is conservation of momentum is another of isaac newton's contributions

01:38

to physics It comes from his laws of motion but

01:41

he wasn't much of a place better He wouldn't All 00:01:43.663 --> [endTime] my great no

Related Videos

AP Physics 1: 2.5 Changes and Conservation Law
445 Views

AP Physics 1: 2.5 Changes and Conservation Law. At what point(s) in this situation is energy lost in any form?

AP Physics 1: 1.4 Waves
181 Views

AP Physics 1: 1.4 Waves. Which of the following is technically true for Max as he stands at the edge of oblivion? 

AP Physics 1: 1.4 Changes and Conservation Laws
177 Views

AP Physics 1: 1.4 Changes and Conservation Laws. Find the current across R2.

AP Physics 1: 2.4 Changes and Conservation Laws
172 Views

AP Physics 1: 2.4 Changes and Conservation Laws. Which of the following circuits should the students use?

AP Physics 1: 1.5 Waves
12 Views

AP Physics 1: 1.5 Waves. What can possibly occur when the two waves reach each other?