Catch up TV

This episode is currently not available.

Series 4: 8. Floating and Sand



Today, Maddie’s at sea! First she visits a boating lake, using her special underwater cameras to find out how the hull of a boat is shaped to help it float on water. She learns how even big heavy things can float because of a force called buoyancy.\n\nNext, Maddie heads to a beach to discover how sand is made. She explains how a process called weathering breaks the rocks down to small pieces and how all the tiny grains of rock make sand. She then uses a special microscope camera to see how thousands of bits of different minerals like quartz make up sand.

Source: CBeebies

Most recent episodes of Do You Know?

Do You Know?

Do You Know? - Series 1: 4. Bin Lorry And Newspaper

Series 1: 4. Bin Lorry And Newspaper

Maddie does the recycling. She uses a special camera to find out how a bin lorry works to lift a bin and tip the rubbish into the hopper. An animation reveals how a moving wall ...

08-07-2025

CBeebies

All episodes

CBeebies

Do You Know?

Do You Know? - Series 1: 2. Fire Engine Hose And Reflective Strips

Series 1: 2. Fire Engine Hose And Reflective Strips

Maddie looks at the emergency services. She uses a special camera to find out how the hose on a fire engine works and how the pump inside the fire engine creates pressure and se ...

07-07-2025

CBeebies

All episodes

CBeebies

Do You Know?

Do You Know? - Series 2: 21. Fish Tank And Bath

Series 2: 21. Fish Tank And Bath

In today's episode, Maddie finds out about things that use water. She visits an aquatic centre to show us how a fish tank works, using a special underwater camera to explain how ...

04-07-2025

CBeebies

All episodes

CBeebies

Do You Know?

Do You Know? - Series 2: 20. Kite And Wind Turbine

Series 2: 20. Kite And Wind Turbine

In today's episode, Maddie is outdoors finding out about things that use the wind. She finds out how a kite works when it flies high in the sky, shows us how to measure the wind ...

03-07-2025

CBeebies

All episodes

CBeebies

Do You Know?

Do You Know? - Series 2: 19. Television And Carpet

Series 2: 19. Television And Carpet

In today's episode, Maddie is relaxing at home, playing games and watching television. She shows us how a television screen works using millions of tiny squares called pixels. U ...

02-07-2025

CBeebies

All episodes

CBeebies

Do You Know?

Do You Know? - Series 2: 18. Lift And Spacesuit

Series 2: 18. Lift And Spacesuit

In today's episode, Maddie is finding out about things that go up and down. She shows us how a lift works, when it carries people up and down between floors of a building. With ...

01-07-2025

CBeebies

All episodes

CBeebies

Do You Know?

Do You Know? - Series 2: 17. Bubbles And Chocolate

Series 2: 17. Bubbles And Chocolate

In today's episode, Maddie is having a party! She finds out how bubbles work when we blow into bubble mixture. She shows us how the surface tension of water changes when we add ...

30-06-2025

CBeebies

All episodes

CBeebies

Do You Know?

Do You Know? - Series 2: 16. Posting A Letter And Colouring Pencils

Series 2: 16. Posting A Letter And Colouring Pencils

In today's episode, Maddie is sending a letter in the post to the CBeebies house. She finds out how posting a letter works as she follows the letter's journey from the post box ...

27-06-2025

CBeebies

All episodes

CBeebies

Do You Know?

Do You Know? - Series 2: 15. Disco Ball And Jigsaw Puzzle

Series 2: 15. Disco Ball And Jigsaw Puzzle

In today's episode, Maddie is having fun. She takes to the dance floor to show us how a disco ball works. We learn how light is reflected in lots of different ways, and a specia ...

26-06-2025

CBeebies

All episodes

CBeebies

Do You Know?

Do You Know? - Series 2: 14. Playground And Plant Pot

Series 2: 14. Playground And Plant Pot

In today's episode, Maddie is having fun outdoors. First, she's in a playground learning how we keep swinging on a swing and how gravity helps us slide down a slide. She uses a ...

25-06-2025

CBeebies

All episodes

CBeebies

Most popular episodes of Do You Know?

Do You Know?

Do You Know? - Series 4: 5. Drinking Water And Carrot

Series 4: 5. Drinking Water And Carrot

In this episode, Maddie visits a reservoir that collects water from our homes, natural springs and the rain. She heads to a draw-off tower, which takes water from the reservoir ...

11-04-2025

CBeebies

All episodes

CBeebies

Do You Know?

Do You Know? - Series 2: 19. Television And Carpet

Series 2: 19. Television And Carpet

In today's episode, Maddie is relaxing at home, playing games and watching television. She shows us how a television screen works using millions of tiny squares called pixels. U ...

02-07-2025

CBeebies

All episodes

CBeebies

Do You Know?

Do You Know? - Series 2: 14. Playground And Plant Pot

Series 2: 14. Playground And Plant Pot

In today's episode, Maddie is having fun outdoors. First, she's in a playground learning how we keep swinging on a swing and how gravity helps us slide down a slide. She uses a ...

25-06-2025

CBeebies

All episodes

CBeebies

Do You Know?

Do You Know? - Series 1: 25. Cake And Soft Play

Series 1: 25. Cake And Soft Play

Maddie is getting ready for a party. She uses a special camera and animation to find out how cake ingredients work together to make cake sponges rise in the oven. Next, Maddie v ...

05-06-2025

CBeebies

All episodes

CBeebies

Do You Know?

Do You Know? - Series 4: 6. Radio Telescope And Maze

Series 4: 6. Radio Telescope And Maze

Today, Maddie is finding things! First, she visits an observatory to see how a really big radio telescope uses powerful computers to collect radio waves from space and turn them ...

14-04-2025

CBeebies

All episodes

CBeebies

Do You Know?

Do You Know? - Series 5: 3. Farming Robots And 3d Printer

Series 5: 3. Farming Robots And 3d Printer

Maddie visits a robot workshop where they design farming robots that help farmers grow crops. She meets three farming robots, Tom, Wilma and Richard that work together on the fa ...

11-07-2021

CBeebies

All episodes

CBeebies

Do You Know?

Do You Know? - Series 2: 22. Hand Dryer And Toilet Roll

Series 2: 22. Hand Dryer And Toilet Roll

In today's episode, Maddie is looking at things we use when we go to the toilet. She visits a factory to see how hand dryers work. She shows us how infrared light is used to swi ...

09-04-2025

CBeebies

All episodes

CBeebies

Do You Know?

Do You Know? - Series 4: 2. Bird's Nest And Helmet

Series 4: 2. Bird's Nest And Helmet

In this episode, Maddie learns all about strong structures. She goes to a nature reserve to find out how a bird makes its nest using twigs, moss, leaves and dried grass. She als ...

08-04-2025

CBeebies

All episodes

CBeebies

Do You Know?

Do You Know? - Series 3: 14. Digestion And Meringue

Series 3: 14. Digestion And Meringue

Maddie learns what happens to food in our bodies when we eat it and why it’s important to eat a variety of different foods from different food groups. We find out which fo ...

23-11-2023

CBeebies

All episodes

CBeebies

Do You Know?

Do You Know? - Series 4: 1. Starlight And Stop-frame Animation

Series 4: 1. Starlight And Stop-frame Animation

In this episode, it’s night-time! Maddie visits a planetarium to learn how stars work. She discovers that stars are made in space by dust and gas, and when they press toge ...

07-04-2025

CBeebies

All episodes

CBeebies

© 2025 - Catchupplayer.co.uk