AP Physics 1: 3.5 Changes and Conservation Laws

radius are there is spinning on top of a pole

has shown all right Which of the following would increase

the rate at which the plates spin Select two here

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

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

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

that angular momentum equals mass times velocity times the objects

radius or we just got a clever too one day

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

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

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

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

know that if we want to raise velocity we have

tto lower one of the other variables That means we

can decrease the mass of the plate or decrease the

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

or both would mean that the velocity would have to

increase to maintain a total angular momenta So are correct

choices are a and c and looking at our equation

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

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

small way that the edge of the plate would increase

mass was it would throw off the delicate balance of

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

even wanna think about Answer date Speaking of super genius

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

to physics It comes from his laws of motion but

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