So WHY did that happen?

Think back over the experiments that we have done in the last week.

Choose two or three of these experiments to record in your journal.  
(9 experiment listed below with pictures and some videos)

Experiment Title

1. Draw a diagram of the experiment
2. Write down the main observations you made (what happened, saw, heard, felt, smelt)
3. Explain your ideas about why this happened 

Here is a reminder of the experiments that we have done and some questions to try and answer.

Water Balloon over a Candle

Why didn't the balloon burst?
What happened to all the heat from the candle?
Why didn't the rubber burn?

Title

1. Draw a diagram
2. Report what you observed
3. Explain your thinking

The Relighting Candle

How is it possible for the candles to be relight without putting a flame to the candle wick?
How did the flame jump to relight the candles?

Title

1. Draw a diagram
2. Report what you observed
3. Explain your thinking

The Soda Bottle Water Rocket

Why did the bottle shoot off the cork?

Why did the bottle go a shorter distance when it had more water in it?
Why did the bottle go a shorter distance when it had only air in the bottle?

Why did the bottle shoot the best when it was about half air and water in the bottle?

Title

1. Draw a diagram
2. Report what you observed
3. Explain your thinking

SOUND EXPERIMENTS

• The singing wine glass

  

• Tuning fork in water

• Tin can telephones

• Fork and string to your ear!

• The amazing singing pipe

• Bottle blowing

Water Bottle Rocket

Aim 
Say what you are trying to investigate - to do - to show

Equipment 
List the things you need to do this experiment

Diagram
Draw a labelled picture of the experiment

Method  

Explain in clear steps what you need to do for this experiment

Results 
Report what you observed - what happened?

Conclusion
Suggest your thinking and ideas about why the thing you observed happened

Balloon and Candle Experiment

Balloon and Candle Experiment

Aim

Investigate what happens when you put a balloon into a candle flame.

Equipment

Balloons

Candle

Matches

Ruler

Water

Diagram

Draw a labelled picture of the experiment

Method  - Part 1

First blow up the balloon.  Next light the candle with a match.  Hold the balloon high above the burning candle.  Slowly lower the balloon so that it gets closer to the burning flame.  Keep lowering the balloon until you notice something.

Observe closely

Predict what might happen?

Part 2

Try this experiment a second time but change one variable.  Half fill another balloon with water then lower this water balloon into a candle flame to see what happens.

Results  (report what happened)

When the first balloon was about 7 cm above the candle flame the balloon burst.  There was a bang, the candle flame went out and there was a smell of smoke.

When the water balloon was lowered on to the flame the balloon did not burst.  Something black collected on the base of the balloon but this was easily rubbed off.  We even put the base of the balloon into the flame and it did not burst!

Conclusion

(explain why the first balloon burst and why the second balloon did not burst)

Example - Experiment Report

Aim 
Say what you are trying to investigate - to do - to show

Equipment 
List the things you need to do this experiment

Diagram
Draw a labelled picture of the experiment

Method  

Explain in clear steps what you need to do for this experiment

Results 
Report what you observed - what happened?

Conclusion
Suggest your thinking and ideas about why the thing you observed happened

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Example Diagram
(here is an experiment to try)

Balloon Experiment #1

Aim 
The aim of this "challenge" is to push a wooden skewer through an inflated party balloon without popping the balloon.

Equipment (Things You Need)
1x party balloon,  1x wooden skewer

Method  (What You Need to Do)

Blow up the balloon and tie a knot at the end.  Now try and push your wooden skewer through the balloon without popping the balloon!

Results (What Happened)
Most people burst their balloons.  Some people managed to get the skewer into the balloon without bursting it, but it was hard to get the skewer to go all the way through.  Max managed to do it without bursting the balloon.

Conclusion (how to have success)
What did Max do to be successful?  Highlight below to see.
Push the skewer into the balloon close to the knot where the rubber is not stretched too much.

Push the skewer out of the balloon at the top where the rubber has not stretched too much.  Be careful.  Hold the spot that you are pushing with your finger.  Slowly twist the skewer to push it through the rubber.

Finn explains what to do

 Nevaeh blowing up her balloon

 Bailey blocks his ears

 Pinch the skin of the balloon and slowly push the skewer through!

Max the Magician!

Sound Investigation Kit

Sound Investigation Kit

Þ   2 m length of string

Þ   An old fork or spoon

Þ   Washed out tin can

Þ   2x Drinking straws

Þ   Inside of a toilet roll

Þ   Selection of elastic bands

Þ   A small candle

Þ   Washed takeaway box

Þ   A small (330 ml) bottle

Þ   A ruler

Þ   A pencil

Þ   Your ears