0:00:02 > 0:00:04- Hello, I'm Bitz. - And I'm Bob.
0:00:06 > 0:00:08We love making do.
0:00:08 > 0:00:11- And with a little bit of know-how, - you can do it, too!
0:00:11 > 0:00:12Let's go!
0:00:12 > 0:00:18# We can work it out
0:00:18 > 0:00:22# I can work it out
0:00:22 > 0:00:28# And we'll invent a way through ideas and play
0:00:28 > 0:00:29# Bitz and Bob!
0:00:29 > 0:00:30# We'll save the day
0:00:30 > 0:00:34# Bitz and Bob! Bitz and Bob! Bitz and Bob! #
0:00:34 > 0:00:37Do you remember how engineering helped us
0:00:37 > 0:00:41to save Bevel from slipping and sliding off High Snowy Mountain?
0:00:41 > 0:00:43Err...no. It's slipped my memory.
0:00:43 > 0:00:44THEY CHUCKLE
0:00:44 > 0:00:47Bevel kept slipping on the snow because he
0:00:47 > 0:00:49didn't have grippy snowshoes.
0:00:49 > 0:00:53When things are grippy or rough, they have a lot of something
0:00:53 > 0:00:56called friction, which helps to stop sliding.
0:00:56 > 0:00:58Bevel slid out of control.
0:01:00 > 0:01:05- Oh, no! We need to catch up with Bevel!- But how?
0:01:07 > 0:01:08By sliding faster.
0:01:08 > 0:01:12If things need to be slippy, like slides, they're engineered
0:01:12 > 0:01:16to be really smooth so there's very little fiction.
0:01:16 > 0:01:19Oh, yeah! Look how quickly they're going.
0:01:19 > 0:01:22We needed to slide quickly to save Bevel,
0:01:22 > 0:01:25- didn't we, Bitz?- Yes. Let's see how.
0:01:26 > 0:01:28It's time for a Bitz Brain Blitz!
0:01:30 > 0:01:34Bob's sign doesn't stick to the snow when it slides.
0:01:34 > 0:01:37That stickiness is called friction.
0:01:37 > 0:01:40Because there is low friction between the sign
0:01:40 > 0:01:42and the snow, we can use it to make a sled,
0:01:42 > 0:01:45and slide faster along the snow.
0:01:46 > 0:01:50Now it's your turn to try.
0:01:50 > 0:01:53Our friends are sliding their soft toys along the ground.
0:01:55 > 0:01:59They're not sliding very far on the carpet, Bitz.
0:01:59 > 0:02:03The carpet surface is all bumpy against the soft toys'
0:02:03 > 0:02:05furry tummies.
0:02:05 > 0:02:08They keep getting stuck!
0:02:08 > 0:02:11Now, let's try the lino floor.
0:02:13 > 0:02:15Oh, yeah! Let's see it again!
0:02:16 > 0:02:21The floor is much smoother than the carpet and creates less friction.
0:02:21 > 0:02:24Smooth is low friction and slides.
0:02:24 > 0:02:28Rough is high friction and grips.
0:02:28 > 0:02:32The less friction there is, the quicker things can go,
0:02:32 > 0:02:36which is just what we needed on High Snowy Mountain.
0:02:36 > 0:02:37Woohoo, yeah! We're off!
0:02:38 > 0:02:44There's Bevel! Woohoo! We're getting closer! Woohoo!
0:02:44 > 0:02:45Woah! Help, people!
0:02:45 > 0:02:47Robo Bug to the rescue!
0:02:47 > 0:02:51Now we're going to make our own slides to
0:02:51 > 0:02:54find the best surfaces for duck racing. Quack quack!
0:02:56 > 0:02:59- Take a cardboard box. - They're colourful.
0:02:59 > 0:03:01And stick different materials onto them,
0:03:01 > 0:03:05like sandpaper or fabric for your toys to slide down.
0:03:06 > 0:03:09Make sure your slides are at the same height
0:03:09 > 0:03:11and slope so it's a fair race.
0:03:11 > 0:03:18First up it's sandpaper versus fabric. And go!
0:03:18 > 0:03:22One duck slides down the smooth fabric, but the friction
0:03:22 > 0:03:25of the bumpy sandpaper means the other duck's stuck.
0:03:25 > 0:03:27Quack Quah Quaah.
0:03:28 > 0:03:32Now they're sliding on bubble wrap and tinfoil.
0:03:35 > 0:03:39The bubble wrap's so bumpy that the duck rolls down instead of slides!
0:03:39 > 0:03:44- Heh heh! - But the tinfoil's really smooth.
0:03:45 > 0:03:49So the duck slides superfast. Awesome!
0:03:51 > 0:03:53That's it! Steam pink style!
0:03:53 > 0:03:58Keep engineering and inventing your way to save the day.
0:03:58 > 0:03:59You can do it too!