Hi, everyone.

I'm Mrs. Courts, and I'm very pleased to join you for today's lesson on Testing Bridge Structures.

This is part of the Frame Structures: Bridges unit.

Our lesson outcome for today is I can test a bridge structure to determine its strength.

In today's lesson, we have three key words.

I'll say them first, and then you repeat them after me.

Are you ready? Brilliant.

Our first word is testing.

Testing.

Super.

Testing is trying something to see if it works so that changes or improvements can be made.

Success criteria, success criteria.

Super.

Success criteria is a list which helps to see if the object does what it's expected to do.

Feedback, feedback.

Super.

Feedback are comments or suggestions on how to improve a product.

Well done, everyone.

Great listening.

In today's lesson of testing bridge structures, we have two learning cycles, two parts to our lesson.

Our first part is testing bridges.

Testing is a way of checking if something works.

It also allows the designer to find ways to change it and to improve it.

For the bridge to work, it is important that the bridge meets the design specification.

Sofia says, "The goats want to get across the bridge to get to the other side.

They don't want to meet the big troll." Good point, Sofia.

So that's the purpose of our bridge, to get the goats from one side to the other.

Take a few minutes to have a look at this design specification.

You might recognise it.

Who is using the bridge? Well, that's the three goats.

They'll be using the bridge.

Why are you building the bridge? Well, that's to help the goats get to the lovely fresh grass on the other side of the river, without meeting the troll.

What is important about the bridge design? Well, the bridge needs to be strong and sturdy and freestanding.

Designers test throughout the making process, and this helps them to make sure that everything works.

Sofia says, "Engineers check that the bridge works and then they know if it is safe for others to use.

An engineer would test the bridge regularly." So they wouldn't just wait till the end.

Well done, Sofia.

They'd test it all the way through and spot any problems. We are ready for our first check for understanding now.

Are you ready? Brilliant.

When should a bridge engineer or designer test if their bridge works? Is it a, at the end of making it, b, throughout the making process, or c, never? When should a bridge engineer or designer test if their bridge works? Pause the video now and have a little think.

Welcome back.

So when should a bridge engineer or designer test if their bridge works? That's right, throughout the making process.

Well done.

Designers and engineers use their design specification to create a success criteria to test against.

So the success criteria for bridge, could be: Is it stable and strong? That it allows the goats to cross over it.

And it is freestanding.

If something works, then it is a success.

Can you show me your thumbs up for a success? Well done.

We are ready for an next check for understanding now.

Hope you're listening really carefully.

What are success criteria? Are they a, a list which can be used to check if something works, b, rules on how to make something, or c, drawings of the final product? What are success criteria? Pause the video now and have a little think.

Welcome back.

So what are success criteria? That's right, they're a list which can be used to check if something works.

Well done, everyone.

We could see if the different goats could cross the bridge.

We could use cubes to show the different sizes of each billy goat.

That is a great idea, Sofia.

You could test the bridge.

Well done.

To test the bridge with different weights for each billy goat, you could use cubes.

You might choose to use one cube for the little goat, three cubes for the middle goat, and five cubes for the big goat.

So one cube for the little goat, three cubes for the middle goat, and five cubes for the big goat.

That shows that they're different-sized goats.

Well done.

So to test the bridge, you will need some goat templates.

How many goat templates do we need? That's right, three.

A little, a middle, and a big.

Well done.

We need some scissors and we need some cubes, a stapler, your bridge, and a worksheet and pencil.

To make your goats, cut out your templates.

Be really careful to follow the lines.

Then fold the templates.

There's two fold lines, which are in the middle of the templates that need to be really carefully folded.

If you struggled, use a ruler so you can fold against the ruler.

Number three, staple the top of the template.

If you haven't got a stapler, you could use glue.

And finally, add your cubes to your goat.

To test the bridge, you could try each goat on the bridge and see if it can hold the different-sized goats.

Then you could try all of them on the bridge.

We are ready for our first task now, task A.

So I'd like you to test that your bridge works.

And then I want you to check that you've met all the success criteria.

Is it stable and strong? Does it allow the goats to cross over the bridge? And is it freestanding? Pause the video now and complete task A.

Welcome back.

Well, I hope you had lots of fun testing a bridge.

Did you remember to check your success criteria? Excellent.

Is your bridge stable and strong? Super.

Does it allow the goats to cross over the bridge? Excellent.

And is it freestanding? Super.

Well, Izzy tested her bridge, and she says that she enjoyed testing the bridge.

And the bridge was able to hold all three goats.

"I found the ramp onto the bridge was not strong enough," said Izzy, "and kept bending.

It was also too steep and therefore the goats fell off it." Oh dear, Izzy.

Maybe you can have a think about that and see if you can improve it later.

We are ready for the next part of our lesson now of testing bridge structures, which is giving opinions.

Once the bridge has been tested to see whether it meets the success criteria, it is important to share feedback.

Laura said, "Feedback is a way of getting people's opinions." Brilliant, Laura.

Well done.

Feedback is important.

Designers use it to get other people's views and ideas.

And this feedback helps the designers to make changes to their future work.

We are ready for our next check for understanding now, and this is a true or false question.

Feedback helps designers and engineers to get people's views.

Is this true or false? Pause the video now and have a little think.

Welcome back.

So true or false feedback helps designers and engineers to get people's views is true.

Well done.

Why? That's right.

Feedback is important as designers use it to get different views and ideas.

Feedback helps the designer to evaluate their work.

Well done, everyone.

Feedback is like a sandwich.

It's got three parts.

So remember to tell your friend something that you liked about their work, something that they could change to make their work better, and something that makes you happy or that you enjoyed using in their work.

This type of feedback is called peer evaluation.

When you give feedback, you do need to remember to be: "Kind," said Izzy.

"Think of other people's feelings." Lucas says, "Be useful, think of something that is going to help them." And Jacob said, "Above all, remember to be respectful.

Remember that everybody does things very differently." We are ready for our next check for understanding now.

Are you listening carefully? Super.

So when you give feedback, you need to remember to be kind, unkind, respectful, or disrespectful.

So a, kind, b, unkind, c, respectful, or d, disrespectful.

Pause the video now and have a little think.

Welcome back.

So when you give feedback, you need to remember to be kind and respectful.

Well done, everyone.

We are ready for task B now.

And I'd like you to talk to your friends and ask for feedback about your bridge.

Remember that feedback should include something that you liked about the other person's work, something they could change and make better, and finally, something that makes you feel happy or that you enjoyed using within their work.

Pause the video now and complete task B.

Welcome back.

And I hope you had lots of fun talking to your friend and giving and asking for feedback.

Well, Andeep said, "I really like the colours and the finish of this bridge." That's a really kind, positive comment.

Well done, Andeep.

And Sam said, "The ramp onto the bridge needs more support because it's bendy and the goats keep falling off." Oh, that's another very good point, Sam.

Well, I'm pleased that you managed to talk about your bridges and give positive, good feedback.

Well done.

We've reached the end of our lesson for today, and I hope you've had lots of fun testing your bridges.

I wonder if you can show me a thumbs up if you feel that you've met these learning points along the way.

Testing is an important way to check that the bridge works.

Well done.

Tests can include recording how well the design worked.

Well done.

Talking about the test results helps decide how well the design worked.

Well done.

And finally, feedback helps to make improvements and changes to future ideas and designs.

Brilliant.

Well done for all of your hard work throughout this unit.

See you soon.

Bye.