Thursday, 21 November 2013

Race a speed boat

This is a reflection on a science experiment race a speed boat.

Race a Speedboat
Can you make a paper boat race across the water just by gently touching the surface of the water?
Hypothesis (What I think will happen)
The washing liquid will make bubbles and push the boat along the water.
Coloured card, washing up liquid, pencil or sharpie, scissors, large container of water.

Method (What we did)
1. Try put the container of water outside or in a place that can get wet.
2. Use the coloured card to make a boat shape (try keep it flat)
3. Put boat on one end of the water
4. put just a dab of washing liquid on your finger and place it behind the boat just a little in the water.
5. WOOSH the boat will go from one side to the other  “Whoa”

Observation (What happened)
The boat went from one side to the other

Conclusion (Why I think it happened)
because as you put your finger in it brook the surface of the water creating a air bubble and the washing liquid is trying to push it away while the water is trying to close up and then the washing liquid win therefore push it away.

Short Experiment to Follow Up
Make Metal Float
Gently place a paperclip on the water’s surface.

Hypothesis (What I think will happen)
it will sink because it is metal paper clip

Observation (What happened)
it sank then we made it float.

Conclusion (Why I think it happened)

it floated because as the hand was underneath it was holding air and keep it up.

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