Intro Quiz: How can we tell if a material is magnetic or not?

Video: How can we tell if a material is magnetic or not?

﻿Hello, everybody, welcome to your fifth lesson on magnetism with me Ms. Roberts. It's so great to your back here today. So Lenny, the lion and I are here for another lesson, he sits by my screen and listens to all of my star words and information. So if you want to, you can go and get your favourite Teddy, and your resources that you're going to need. Just before I show you what resources do you need, let's have a quick recap. Last lesson, we looked at the field lines around a magnet, but I wonder if you can remember what were the two ways that we discussed that you could show the field lines. What was the first way that you could use, with a pencil and a small resource? Well done, drawing it round it with a compass along the lines of the force. And the other way was, scattering the iron filings, well done. Because the iron findings will fall on the field lines around the magnet, on the force, so well done everyone. So it's time to get ready for this lesson. You're going to need a pencil or pen a ruler, a notebook, and if you've got one, a magnet. I've got bar magnet it's like this, but if you've got a different type of magnet, then that's okay too. I've also got my favourite Teddy, so you could grab yours as well. Pause the video and get the resources you need now. Okay, in today's lesson, we're going to do our star words, then we're going to look at permanent and temporary magnets. We're then going to look at how we make a magnet, and then look at magnetic and non-magnetic materials. Then at the end, I've got another think question for you, so let's get started with our star words, star words, star words. Well done, you guys are really good at that now. Okay, the first word is magnetic, your turn, magnetic, your turn. The next word is force, your turn, force, your turn, well done. Permanent, permanent, permanent means forever, can you say that? Well done, permanent means forever, permanent means? So if something is permanent, it means it lasts forever. And temporary, your turn, temporary, your turn. So something is temporary, it doesn't last forever, if something is temporary, then it doesn't last forever. So if I have something that doesn't last forever, then what can I say it's also? Temporary, well done. And poles, your turn, well done. And last word is field, your turn, well done. Good job on the actions, everybody. Okay, so let's look at permanent and temporary magnets. So on the screen, you can see iron, steel and nickel. And we've talked before, about how these materials are all magnetic, what are they all? Magnetic, well done. So although not all materials are magnetic, iron, steel and nickel are examples of materials that are. And this means that they can be turned into magnets. So for instance, iron here could be turned into a magnet. Currently as a magnetic material, it's attracted to the North and the South pole of a magnet. But if we turned it into a magnet, then it would work similarly to a bar magnets, with a North and a South pole. Now they can be turned into a magnetic, into a magnet sorry, either permanently or temporarily. And that's what we're going to look at just now. So iron can be turned into a magnet steel can be turned into a magnet, and nickel can be turned into a magnet. What's the two types of magnet that they could be turned into. Here's the clue from your star wood's this or this. Can you tell your screen? Well done, they could be permanent or temporary. And just to recap, temporary means it doesn't last forever. Permanent means it will always be like that forever. So if you turn a material like nickel, for example, into a temporary magnet, it could that be then turned back into nickel as normal. Let's look how on earth we would do this. If I was turning iron into a magnet, so not just a magnetic material, but into a working magnet, I could do this by stroking the edge of the iron, using one of the poles. We're going to look at that later in the lesson, so don't worry too much about the, the detail of how we turn it into a magnet, but you stroke the metal with a magnet. So this will be my magnet, and if I had the, the iron just going to use a safety pin as an example, you would stroke it along one side of it. If you then turned it into a magnet and both North and a South pole within the piece of iron that you've got, but if you wanted to then turn it back into normal iron, you could do, but you would need to heat it. So if you want it to turn it back from a magnet into a normal piece of iron, you could do this by heating it to a very high temperature. Okay, so let's see how much you have listened and remembered. Okay, so let's see how much you have listened to and remembered, based on temporary and permanent magnets. Question one, what are the three types of magnetic materials we looked at. Question two, what happens when you place a magnetic material close to a magnet? And something magnet can stay magnetic for a short time, so it doesn't last forever. I'd like to pause the video, and write the answers down to these questions on your notebook now. Okay, pause the video if you need more time, because I'm going to go through the answers. The three examples of magnetic materials were iron, steel and nickel. If you place a magnetic material close to a magnet, it will be attracted to both poles. And a temporary magnet is the type of magnet that can stay magnetic for only a short amount of time. So now what I'm going to do, is I'm going to show you a video of how you would make a magnet. I gave you a very brief demonstration, but now I'm going to show you a video about how to do it properly. When you're watching this video, I want you to watch the motion that she uses in order to turn it into a magnet. It's already made of magnetic material, but she turns into an actual magnet, that can attract or repel materials that are magnetic. If you've got a magnet, oh, and you've got, oh, it's a trap, it's magnetic, it's my laptop, that's interesting. If you've got a magnet and you've got, I've got a safety pin, I actually tried that experiment and it worked with a safety pin so either side, if you don't then that's okay. But it is quite interesting to see how it works, so have a go if you can. So let's just have a think. The video that we've just watched is called the single touch method, can you say that back with me? Single touch method, your turn. And that's because when she was stroking it along the magnet, that was a single touch, so one, one, one, one, one, so she said you had to do it 50 times, so that's a single touch method. I'm going to show you on the screen now, some writing, I'm going to make it bigger, and I'd like you to complete this sentence, using the words at the bottom of the screen. So the single touch method involves moving a single something, along the surface of a magnetic material in the same something, from top to something, many times. Pause the video, and I'd like to write out the sentence and fill in the blanks, using the words at the bottom of your screen, pause the video and write that sentence out now. Okay, pause the video so that you can complete that sentence. And here were the words, direction, bottom and magnet, let's see if you've got it right. The single touch method involves moving a single magnet, along the surface of magnetic material, in the same direction from top to bottom many times. So like she said, it was really important that she didn't go up and down when she was doing it, she had to recap round and round, and round, and round and round, on that single touch method. And that's how you can turn a magnetic material into an actual magnet, isn't that amazing? That it can then have a magnetic force around it and a field that attracts metallic materials? That's right, magnetic materials. I just find that absolutely fascinating. Okay, so now we're going to sort magnetic and non-magnetic materials. So magnetic materials are when they are attracted or repelled by magnets, but non-magnetic materials have no change when they come into contact with the magnets, I'm going to show you some examples. On the screen, you can see a little table, magnetic, and non magnetic. I'd like you to jot that down on your notebook now, and I'm going to show you some materials, and see if they're magnetic or non magnetic, and then I'd like to write them in your table. So here's my magnets, my first object that I've got is a wooden pencil. Do you think that's going to be magnetic or non-magnetic? Can you tell your screen? Let's see if you're right. Here is the pencil, and there was no change when it comes into contact with the magnet, so that is non magnetic, so put that in your non-magnetic. So there are other examples I'm going to show you into my visualizer, because it will be easier for you to see, whether they are attracted or repelled. So here's my magnet, my next material is a five p coin, and this I'm going to draw the magnet closer to it, and you can see what happens, so what happened there? Was it attracted, repelled or no change? And you can see when I pick it up, that it's attracted. So therefore this five p coin is magnetic, well done. The next material that I've got is a spoon, this small teaspoon, let me just see if I can focus it, there we go. So here's my magnet, here's my spoon, I'm going to put my magnet closer to the spoon, and you can see that it's attracted, and I can actually even pick up the spoon with the magnet. That's cool, isn't it? So, does that make the spoon magnetic or non-magnetic? Well done, it's most likely that's made out of steel, that small spoon there. The next object I've got is a plastic ruler. This is a solid plastic ruler, let's see if there's any change when I put the, let's move this, put the magnet that near it. Nope, it's not being repelled and it's not being attracted, so that ruler is, write it down and we'll see if you're right in a moment. And the other material I've got is a glass oh, that's very big, is a glass cup that's made of glass, obviously. So here's my magnet, let's see, and does anything happen? Nope, so it's not attracted or repelled, just being moved by the magnet. Jot that one down on your table. And I've also got one of my, oops, it's gone straight away, my safety pins, oh, I can't even put it far enough away look at that. How close can I? Mm, there we go, so my safety pin, is that magnetic or non-magnetic? Make sure you've got all of those filled into your table, 'cause now I'm going to show you, how I would sort those into magnetic or non-magnetic. So the wooden pencil was non-magnetic, the safety pins were magnetic, the plastic ruler was not magnetic, and nor was the glass cup, but the coin and the spoon were magnetic as well. So, I hope you got all of those in. Pause the video if you need more time to finish those off. What I now going to do is show you an image on the screen. So what do you think is going on here? I'd like to tell you a screen, what can you see in this image? Can you see the magnets? Can you point to it on your screen? Can you see the pile of white and black materials? Can you point to them? Well done, that's a mixture of flour and iron filings. So iron filings are made of iron obviously, and iron is a magnetic material, flour is not a magnetic material. What do you think is happening in this image? Can you pause the video, and try and explain it to your screen? Well done, pause the video if you haven't quite finished there. So, what's happening here is that in the first image, there is a pile of flour and iron filings, mixed all together. Then someone's taken a magnet, and is moving it closer to the mixture. And then you can see in the third image, all of the iron filings are going towards what? Are they being repelled attracted or no change? Well done, they're being attracted the magnet, but what's happening to the flour? Can you tell your screen? Well done, the flour is not moving, it's just staying on the wooden block. And then lastly, in the final image on the right, what's happened there? where are the iron filings, can you tell me? Good, and where's the flour? Well done, there's been no change to the flour, but the iron filings have stuck to the magnet. That's a really interesting way to sort materials. So if I wanted to get a magnetic piece of material out of a non magnetic material, that maybe it was a bit tricky, I could use a magnet, and it would be attracted to it. So lastly, following on from what we just looked at, I have a think question for you. How could magnets help us to solve recycling materials, if iron is mixed in with the recycling? So when you go to the bin, either at home or at school, or maybe out and about, there is often a bin, that has recycling in it. So if you finished with your paper cup, or if you finished with your metal materials that you don't want anymore, you don't put them in the normal bin, you can put them in the recycling bin. But how could magnet help to sort that whole mixture of materials? Because if you've got paper and plastic and metal together, that's going to need sorting, isn't it? So ask an adult at home, ask one of your friends, or you could even ask your teacher, how could magnets be useful when sorting recycling materials? Well done everyone, you've done really well today. I'm going to give you a rainbow cheer, which goes like this, ah, because you've worked really hard. Lenny the lion and I will be back next lesson for a final lesson on magnetism. You've been working so hard everybody, so let's see you next time, and we'll finish our unit on magnetism. Well done everyone, bye.

Worksheet: How can we tell if a material is magnetic or not?

Exit Quiz: How can we tell if a material is magnetic or not?

Completed: How can we tell if a material is magnetic or not?

In this lesson, we will look at how we can tell if a material is magnetic or not and also learn how to make our own magnets!

Science

How can we tell if a material is magnetic or not?

Introductory Quiz

Video

Worksheet

Final Quiz

Lesson Complete