Lesson video

Hello, and welcome to today's lesson about bearings and compass points.

For today's lesson all you need is a pen and paper or something to write on and with.

If you could please take a moment to clear away any distractions including turning off any notifications.

Finally, if you can find a quiet place to work where you won't be disturbed, that would be brilliant.

Okay, when you're ready, let's begin.

Okay, as you can see to the right of the screen we have a compass I'd just like you to take a moment to work out the missing labels on this compass.

Okay, so hopefully you have worked out or thought about or remembered that this it NorthEast, SouthEast, SouthWest and NorthWest.

Now what I'm going to do in a moment is ask you to find some angle facts based on this compass.

What angle statements can you make from this diagram? Anthony says that between South and NorthWest is an angle off 135 degrees.

Zacky says that between North and East there's an angle of 90 degrees.

What else can you work out? Can you work out the angle between two adjacent lines? So two lines that are next to each other? How many right angles are there? Can you find 135 degrees anywhere else? What other angles can you find? Okay ,so I'd like you to pause the video and have a go pause in 3,2,1.

Okay, welcome back.

Hopefully you might have to find lots of angle facts.

Now, if this between that, between North and East that's 90 degrees.

Well, NorthEast is halfway between.

So that means that angle is 45 degrees.

And in fact between any two lines that are next to each other, the angle is 45 degrees.

That is quite an important number on a compass.

You might have also found that there eight right angles.

So don't, if you know its between any two there two apart that is a right angle there.

And because 45,45 is 90.

So it doesn't matter if they're on diagonal or not.

You might have also worked out that any two parts that are opposite each other that is an angle of 180.

The whole compass is 360.

You might have found the number 225 somewhere, or maybe the number 315 and if you haven't you might want to have to think about that.

Okay, so we're going to be looking at bearings today And what is a bearing? Well, you might have heard the expression before I've lost my bearings.

And what that means is you've lost your sense of direction.

Bearings are all about direction and position.

And there's some rules for bearings.

And these rules are very important because of what bearing is used for.

Bearing is used for navigation.

So we must have really clear communication about our position and direction.

So here are the rules.

We must start from North.

Okay, so we always start from North and our second rule, we go clockwise.

Okay, so we go round this way.

And our third rule, we use three fingers.

Now, what does that rule mean? Well, say we had this angel here and I don't know, let's say it was 23 degrees.

So that's the angle of 23 degrees.

But the bearing of this, this point here would be 023 We must write it with three figures.

Now you may think that this rule is quite strange.

However, I'm going to explain why this rule is important.

So imagine if you are on a boat at the sea using radio to communicate and you'll seek the signal and someone tried to tell you, they were a bearing of I don't know 327 degrees.

Imagine when they're saying this they're signal crackles.

So you hear 3 7 and you miss the 2 or you hear 27 But because that is not three figures, you know that they are not correct.

So then you can ask them to repeat it.

So it just means that there is more clarity in our communication.

We are now going to consider how the bearings look on a compass.

So we're going to start at North.

So North has a bearing of 000 okay? Cause that's where we start from.

Now that angle if you recall was 45 degrees but we don't write 45 we write 045 okay, so 045.

East 090, that angle between North and East is 90.

Between North going clockwise to SouthEast that angle is 135.

Okay, so I'd like you to pause the video now and just see if you can work out the rest of the bearings for our compass points.

So pause in 3,2,1.

Okay, so hopefully you've worked out that is 180, that is 225,270 and 315.

And when we get back to North we don't use we keep that zero we don't go to 360.

So we don't go for 360 we just start again with bearings.

What is a sensible estimate for this bearing? Well, that's 045 ,that's 090.

A is a bit past 45 maybe about a 1/3 of the way.

I would say 060 is a sensible bearing noted.

So pause the video and work out a sensible estimate for the bearing of B.

Okay, so I would say B is probably somewhere well, that's 180, that's 225 B is about halfway in between so I'd say somewhere in between 195 and 210 I would say is a good estimate for that bearing as B.

Okay, so we're going to do a multiple choice quiz now.

I'll give you a five second countdown we'll pause the video of you need our time.

Okay, which option is a bearing? 5,4,3,2,1, One and three are not three figures and option four is over 360.

Which option is the bearing for North? 5,4,3,2,1 000 Which option is the bearing for SouthEast pause the video if you need to 5,4,3,2,1 135 so that is what is the bearing going from North clockwise round to SouthEast and that angle is 135.

Which is the most sensible estimate for this back ? Pause the video if you need to 5,4,3,2,1 100 is just a little bit past 90.

Okay, so now it's time for the independent task.

So I would like you to pause the video and complete the task and then resume once you've finished.

Okay, welcome back.

Here are the answers to question one and two I'd like to pause the video on mark your work.

And here are the answers to number three.

This one was a little bit trickier, so don't worry if you struggled with it and we can just we'll just check that together.

So clockwise 90 degrees, clockwise 45 degrees.

Okay, so now it's time for the explore task.

What direction is each student walking in? Which students will pass the same point on their walk? So we've got Anthony here and Ben, they start from point A.

We've got Kyla and we've got Xavier who start from point B.

Which students will pass the same point on their walk? What else can you work out? So just have an explore see if you can work out as much as you can all right? So pause the video in 3,2,1.

Okay, welcome back.

Hopefully you've explored.

Hopefully you've noticed lots of very interesting things.

Anthony is going up this way.

Ben is going down this way.

Kyla is going there and Xavier is going down that way.

Okay, so Ben and Xavier meet at the same point.

Oh, sorry, not meet.

We don't know if they meet, they pass the point what we don't know if they meet and that is something you might have thought about.

Cause it depends on lots of things.

It depends on the distance, how quick the walking.

So they do pass the same point but they don't meet at the same point.

Anthony and Kyla pass the same point over here.

Of course they start at the same point.

So you might argue that Anthony and Ben meet here or pass this little point.

And Kyla and Xavier meet at that point.

So, and there's a few of the things you might have thought about other than who gets there, like who gets there first and you might have noticed this and I really like this, and this is a bit of a teaser for what we're going to be looking at in future lessons, this line and this line, they are actually parallel but the bearings are different.

That's quite interesting.

And that's something that we'll explore further in future lessons.

So that is it for today.

If you'd like to, please ask your parent or carer to share your work on Twitter tagging @OakNational and #learningwithOak.

It's been a pleasure.

I hope you've enjoyed the lesson and well done for working hard.

And I look forward to seeing you next time.

Thank you very much.