![]() ![]() ![]() Can you think of a time when someone nearly fell over because there wasn’t enough friction? What was the floor like that day? What shoes were they wearing?.What do you feel when you rub your hands together? What would change if your hands were covered in slippery soap?.Prior to this lesson you may wish to introduce students to other relevant topics, for example:ĭepending on your lesson’s focus, you may wish to pause the video at certain points to check for understanding, asking questions such as: Our question is how can friction be useful? So we've been talking a lot about where friction comes from, I feel like we should ask them a question, so take it away. There's more of that friction with the water,Īmazing! I love it. It's got more space for water to push up against it, Yeah, so my flat pancake shape has a bigger surface area OK, which one do you think will get to the bottom first? So what we want to do is drop these in the waterĪt exactly the same time and see which one reaches the bottom first. So, in front of us we have a tank of waterĪnd we have some shapes made of modelling clay. I think I've got an idea to test this out. Or when an object moves through air or water. So friction occurs when two solid surfaces interact, The drag from pushing up through the air. It's also having to work really hard to overcome I guess that's why it's hard to run through a swimming pool. Pushing through that air or water slows the object down, Which means you also get it with water and air.Īir resistance is a type of friction you get whenĪn object moves through air, like a parachute.Īnd water resistance is a type of friction you get You get friction any time two surfaces move over each other, Yes.Īnd what's cool is you don't just get friction when two solid OK, so friction occurs when two surfaces move over one another. There's a little bit of friction, it's really not much.īut here we've got over 500 pages overlapped,Īnd the friction between each of those pagesĪnd creates a pretty large friction force Right, when just two pages rub over the top of each other, I don't understand! Come on, pull! Come on, pull! ![]() Two seconds, three seconds? Cool, all right. My question, Mwaksy, is how long will it take youĪre you joking? It doesn't look that hard, so I'm going to estimate I literally took one page from this book and just kept overlapping There's no glue, there's no tape, there's no funny business. This is a very simple but a very cool experiment.Īll I've done is overlapped the pages of these books together. I bet you have some awesome demo to show us how friction works. The apple from sliding straight off it? Exactly.Īnd you've got to thank the friction between the bottom of your shoesīecause that friction stops you from falling over all the time. Is it the friction between the bottom of the appleĪnd the bit of the plate it's touching that stops To overcome that friction, and that generates a bit of heat.Īnd it's the same with the apple and the plate, right? When they move over each other, those rough bits rub together. If you looked super close at your hands you'd see that they are rough. To overcome the force of friction between your hands.įriction is a force that occurs when two surfaces move over each other. That's because you're needing to put in work It's quite hard work, number one and, number two, Push them together tightly and then rub them against each other. So you've got the force called friction to thank for this. It doesn't just fall straight off, it just stays still? So how come when I tilt this plate with my apple on it, Yeah? So I know thatĮarth's gravity is always pulling objects downwards. ![]()
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