Engineering challenges for children. We're exploring friction by racing toys on different surfaces. Which surfaces slow toys down and which speed them up?
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-Hello, I'm Bitz.
-And I'm Bob.
We love making do.
-And with a little bit of know-how,
-you can do it, too!
# We can work it out
# I can work it out
# And we'll invent a way through ideas and play
# Bitz and Bob!
# We'll save the day
# Bitz and Bob! Bitz and Bob! Bitz and Bob! #
Do you remember how engineering helped us
to save Bevel from slipping and sliding off High Snowy Mountain?
Err...no. It's slipped my memory.
Bevel kept slipping on the snow because he
didn't have grippy snowshoes.
When things are grippy or rough, they have a lot of something
called friction, which helps to stop sliding.
Bevel slid out of control.
-Oh, no! We need to catch up with Bevel!
By sliding faster.
If things need to be slippy, like slides, they're engineered
to be really smooth so there's very little fiction.
Oh, yeah! Look how quickly they're going.
We needed to slide quickly to save Bevel,
-didn't we, Bitz?
-Yes. Let's see how.
It's time for a Bitz Brain Blitz!
Bob's sign doesn't stick to the snow when it slides.
That stickiness is called friction.
Because there is low friction between the sign
and the snow, we can use it to make a sled,
and slide faster along the snow.
Now it's your turn to try.
Our friends are sliding their soft toys along the ground.
They're not sliding very far on the carpet, Bitz.
The carpet surface is all bumpy against the soft toys'
They keep getting stuck!
Now, let's try the lino floor.
Oh, yeah! Let's see it again!
The floor is much smoother than the carpet and creates less friction.
Smooth is low friction and slides.
Rough is high friction and grips.
The less friction there is, the quicker things can go,
which is just what we needed on High Snowy Mountain.
Woohoo, yeah! We're off!
There's Bevel! Woohoo! We're getting closer! Woohoo!
Woah! Help, people!
Robo Bug to the rescue!
Now we're going to make our own slides to
find the best surfaces for duck racing. Quack quack!
-Take a cardboard box.
And stick different materials onto them,
like sandpaper or fabric for your toys to slide down.
Make sure your slides are at the same height
and slope so it's a fair race.
First up it's sandpaper versus fabric. And go!
One duck slides down the smooth fabric, but the friction
of the bumpy sandpaper means the other duck's stuck.
Quack Quah Quaah.
Now they're sliding on bubble wrap and tinfoil.
The bubble wrap's so bumpy that the duck rolls down instead of slides!
-But the tinfoil's really smooth.
So the duck slides superfast. Awesome!
That's it! Steam pink style!
Keep engineering and inventing your way to save the day.
You can do it too!
We're exploring friction as our friends find the best surface for duck racing. Let's see which surfaces slow toys down and which speed them up. You can try it too!