# Week14 Lab10StandingWavesLabVideoKitSetUp

**Channel:** mcc physics
**Source:** https://www.youtube.com/watch?v=nwNW9e4GD50
**Transcript page:** https://www.withtranscript.ai/video/nwNW9e4GD50

## Chapters

- 0:12 — Materials Needed for the Lab Setup
- 1:28 — Understanding the Standing Wave Layout
- 4:35 — Assembling Stands, Clamps, and Pulley
- 8:52 — Leveling the Setup and Tying String
- 11:40 — Final Assembly and Safety Checks

## Transcript

**[0:12]:** welcome to the standing waves lab setup video for physics 2220 the items you're going to need for this lab are the AP Physics lab 13 waves on a string box these are the contents of the box I'll show you a closeup of everything you're also going to need need your mass scale plus additional masses from kit 12 there's a little plastic baggie in kit 12 that has some large washer masses and one smaller one also from AP Physics lab 14 kit you're going to need two clamps one of them is a blue clamp clamp and the other one is the three prong extension clamp that has like red or pink fingers on it and that's going to be in the white box that is in the brown AP Physics lab 14 kit box okay a lot of boxes there you will also need a meter stick you will need scissors you're going to need an

**[1:06]:** extra stash of books or Soup cans or something that you can use as weights on a flat surface you're also going to need this box here it will either be found with your kit 14 items or your kit 12 items the box at the top on the label of the box it says heavy support stand 6 in by 9 in with Rod 24

**[1:28]:** in I'm going to show you the complete setup before I show you how to set everything up so that you have a general idea of how it's going to look when you're all done and this is the oscillator it's in your kit box and I want to point out to you I'm going to freeze this we are creating standing waves on this string and this is what you're going to be doing in the lab I want to point out here if you notice you don't see the standing waves over here so well but over here you see them very well and it has to do with the background one of the things I'll be telling you how to set things up is that you want a good background if you can have a plain wall behind your setup that would be great if you could have closet like this behind your setup if you don't

**[2:17]:** have a great background for the setup to where you can see the standing waves simply use all of the boxes that you have been provided for your kits and you can stack them and arrange them in such a way that they provide the background for your standing waves so that you can see them so that's really important also while we're here on the Frozen image I want to point out to you this is called a note and over here both the top and bottom are known as anti noes so more information will be provided to you in pivot instructions but for now just realize this is what your standing waves are going to look like when you're actually creating them so you'll notice we see them here we see the nodes we see the anti- noodes very clearly because we have a background here when it was against the wall it didn't show so well

**[3:09]:** and then we're still seeing them but here we are behind the walls behind us and now you don't see the cing waves and it's like ah uh you can also something else you can do is if you have colored paper you can hold the colored paper up behind the string and then you'd be able to see it so you notice this is gray we can see the string here but over here we don't see it so well the location of where you're going to set everything up is very important for the location what are the items that you're going to need you need to be close to a three-prong power outlet this is the power cord for the resonator don't plug the power cord in until you're ready to use it you don't want the resonator bouncing around when you're trying to set things up and also the resonator itself gets extremely hot very rapidly

**[4:00]:** we don't want you to burn yourself because you left it on too long so please be careful with that only plug the resonator in when you're ready to take data you will need around 2 m of space between the rods preferably against a wall for a background like uh I discussed on the previous slide or you can set up the cardboard boxes like I recommended or have paper that you can hold and go behind the string to see what's going on your setup can be on the floor or a tabletop but you're going to want want to protect your tabletop from scratches with a towel or something because the bases that are holding up the

**[4:35]:** rods can easily scratch a surface this is the scale box so you know what you're looking for when you're looking for your items once you pull the scale out you will measure the masses on the scale you are going to need additional masses the additional masses come from kit 12 the masses that come with kit 13 are these mediumsized ones here in kit 12 you have this very thick one along with these very large washers so we want a mix of these so just go grab the baggie out of Kit 12 with the masses remember which ones correspond to Kit 12s so when we use kit 12 you're able to have the washers that you need for it the items that you're going to be putting together you're going to have a base with a rod and a second base with a rod this second base with a rod is in the second box with

**[5:28]:** either 12 or 14 it's a very flat box these are the two clamps you're going to use the baggies with the masses here's a pulley here is a baggy with a string in it here is your oscillator please realize your bases may not look like these bases here these are just long rectangular flat bases but your bases might also look like this don't worry about the shape of the base that's unimportant as long as you have two bases with two rods the bases are also called support stands either way way whether you utilize the terminology baser or support stand it means the same thing the next thing you're going to want to do is take your rod and screw it into the support base or into the support stand I do want to warn you there is some grease on some of you may find the grease maybe not everyone will actually mine was quite

**[6:21]:** greasy before I took this picture I had already wiped most of the grease up the look at that big lob that's still left in there I want to make you aware of that as so that you don't ruin any items that are nearby by getting grease on them so have that paper towel handy ready to wipe up the excess grease once that's done you can take your Rod insert it into the hole rotate it clockwise to screw it in it doesn't matter which base you or which rod and support base you do this with if the two stands you have have different weights to them take the one that's heavier to support the resonator the resonator already has a clamp attached to it all you have to do is unscrew the wing nut here either slide it over the rod or insert the rod from the side regardless of how you get the clamp onto

**[7:12]:** the rod what is going to be important is you'll tighten down the nut and you will make sure to place the resonator on the opposite direction of the main portion of the support stand on the support stand you are going to place two approximately two very thick textbooks or quite a few Soup cans whatever you can find to prevent the base from jumping around when the oscillator is in operation we want to keep the whole thing very nice and stable you might have to practice a little bit to make sure you have enough Mass on here to prevent the whole thing from shaking and bouncing around you want to on your other rod and support stand is place the blue clamp just like it is here in the picture once you have the blue clamp in place then you're going to want to insert your three-pronged extension so the three-prong extension you'll just unscrew this

**[8:11]:** a little bit insert the three-prong extension there and then just rotate this clockwise to tighten it back up everything is just fingertight you don't have to put any excessive force for any of our clamps the next thing you're going to do is insert the pulley into the three Prim clamp just like you see here in the picture you might need to loosen the three prong clamp just by turning the handle counterclockwise a little bit so what you're going to see is your support bcee is down here at the bottom the rod is close to you the rectangular portion of the support base larger portion of it is facing away from you and the pulley is

**[8:52]:** facing to the right now what you want to do is bring the two support stands relatively close to each other grab your meter stick and what we want to do is make sure they're fairly level the reason why is we're going to Loop some string through this eye hole here and the string is going to come across and sit inside the slot of the wheel on the pulley so we want that to be fairly straight we don't want to make huge adjustments once we get our string connected and so if we do a little bit of the leveling now we'll just have to make Minor Adjustments later I set the meter stick on the resonator and the pulley just kind of gauged it with my naked eye it looked pretty straight actually it wasn't straight when I initially did it I had to make adjustments but I just loosened up the nuts here and raised

**[9:44]:** and lowered what I had to so just level it the best you can with your eye you will be making Minor Adjustments later now we want to make a loop out of one end of our string so grab one end of your string start off a loop pinch the free end to the other end together now you've got yourself a loop what you're going to do next is wrap the loop around your finger once and then you're going to pass the loop through the loop you created with your finger so you see it here it's like tying shoelaces then tighten it up and you'll have a nice knot here do the same thing again wrap the loop around your finger pass the loop through the loop you made with your finger and you'll end up with a double knot you have to have a double knot otherwise it will fall apart on you take your

**[10:36]:** Loop and pass it through the eyelet on the oscillator please realize your string is probably too long you want to cut it down to around 2 and 1/2 M being exact is not necessary it's probably going to end up being shorter than that you have the one Loop you're working with at the other end of the string make a loop it's okay if it turns out to be too long long or Too Short we can always cut it off and make another loop to shorten the string if necessary once you have the first Loop you create it pass through the eyelid of the oscillator take the second Loop that you have and pass it through the first Loop that is the one passing through the oscillator then you just pull that second Loop all the way through you're going to pull all 2 and 1/2 M of that string or 2 m it's going to

**[11:27]:** be between 2 and 2 and2 m of that string through and then you're going to have this very nice solid connection that you can see here the hard Parts done and now we put it all together you have

**[11:40]:** the string from the oscillator so we have the stand with the oscillator somewhere some distance away from this stand the string is going to come all the way across from the oscillator pass through the slit on the pulley here and we're going to let some of the string dangle at this point your you're going to place your two support stands around 2 m apart from each other you will be adjusting that distance but you won't need to be further apart than 2 and 1/2 M it'll be closer to 2 m again being exact is not uh super important at this point when you're collecting data it will be important but for this setup it's not you have your second Loop here at the end of the string place your hanger through the loop and then you can hang masses from it right now how many masses you hang doesn't matter you just want everything to

**[12:35]:** remain stable so you can just Place one washer two washers to start with at this point you're pretty much all set up just a few minor things to add I want to remind you that the oscillator gets very hot make sure you keep it unplugged when you're not using it only when you're collecting data should it be plugged in make sure at this point that the oscillator you have some books stacked onto the support stand so that once you do turn the oscillator on it doesn't go flying around it it it does bounce around a lot so you're going to want some masses on there for stability I'm going to show you the video again so you can kind of have an idea if you have your setup correct or not so we see the oscillators osling with that Loop string that got pasted pass through the string uh from the oscillator goes all the

**[13:33]:** way over to the other end passing through that slot on the pulley it's very important that the string is on the slot of the pulley we see the hanging string here here's the mass hanging from the hanger the wide end of the hanger is what holds the mass so make sure you have the narrow end of the hanger passing through the loop on the string again we want to be able to see your understanding wavs that you're going to end up creating following the instructions that pivot interactives and you're going to need that good background replay this a little bit to point out a few other things here I'm going to remind you I did State this at the beginning of the video but everybody always likes that reminder I'm going to hit pause here where the string is not moving these are called nodes at this location here where we have these football shapes

**[14:27]:** those are called anti noes so just a refresher on that I would not start the oscillator until you read the instructions at pivot if you're going to start the oscillator only start it to test to see how much it's going to bounce around to make sure you have enough Mass on the support stand so it doesn't go bouncing around everywhere follow the directions of pivot interactives you're ready to collect data