Baking Soda Boats
Week 4’s Scintillating Science Session
WALT: ...understand what a force is + (Chemical reactions + scientific procedure)?
A force is a push or a pull.
Forces can make object moves or stop, speed them up or slow them down. Forces can also make objects change direction or shape.
A lighter object needs less force to move than a heavier object
Friction is the force between two objects when you rub them together. Try rubbing your hands together? Do they get hot? You feel the friction between your hands as heat.
Air resistance and friction take time to slow an object down, if you want an object to stop quickly you need to apply further force, for example a brake on a bike.
What is happening with our boats?
Baking Soda Powered Boat
The Science bit
Vinegar (an acid ) and bicarbonate of soda ( an alkali ) react together to neutralise each other. This reaction releases carbon dioxide a gas which is the bubbles you see.
The force of the movement of the carbon dioxide backwards causes a reaction force which pushes the boat forwards.
No comments:
Post a Comment