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Life's Ups and Downs

Topic: 6E Forces in action

This is a SATS revision exercise. Hot air balloons rise and submarines sink but why? Both depend on the principle of upthrust. An Indian textile millionaire reportedly broke the world record for the highest flight in a hot air balloon. The balloon soared to 21,000 metres. Balloonists need to know how to alter the weight of the balloon in order to rise or to fall. Submarines take on water in order to dive and expel it to rise to the surface.

In this activity children learn about upthrust and its effects. They label an explanation of how submarines work. They draw force arrows on a diagram of a hot air balloon and calculate how many children might be lifted.

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Try the Activity Learning Objective

Click to Download Life's Ups and Downs Teachers' notes
Life's Ups and Downs Teachers' notes

Click to Download Life's Ups and Downs Activity
Life's Ups and Downs Activity

   

· That when an object is submerged in water, the water provides an upward force (upthrust) on it

Children will demonstrate this by completing the task on page 3 successfully.

· To represent the direction of forces by arrows

Children will demonstrate this by completing the task on page 4 successfully.

· That weight is a force and is measured in newtons

Children will demonstrate this by completing the task on page 4 successfully.

   
Web Links

E-balloon
How the balloon works

BBC News
Details of balloon flight record

How Stuff Works
How hot air balloons work

Wikipedia - Hot air balloon
All about how hot air balloons work

CNN
Sonar and surfacing: how a submarine works

How Stuff Works
How Submarines Work (animation)

National Geographic
Evolution of subs - photos and facts

 
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