Sunday, 24 March 2013

Cosmic rockets

Last week, before we were hit with such miserable cold weather, we had a rare sunny day and temperatures soared at a whopping 5 degrees-seems like a long time ago already.... Ruben found this cosmic rocket kit out, no idea when or where I bought it from but he was excited to try it. After working out what ingredients we needed-vinegar and bicarb of soda, we read through the leaflet which was about Sir Isaac Newton and his three law's of motion.

First Law:

I. Every object in a state of uniform motion tends to remain in that state of motion unless an external force is applied to it.

Second Law:

II. The relationship between an object's mass m, its acceleration a, and the applied force F is F = ma. Acceleration and force are vectors (as indicated by their symbols being displayed in slant bold font); in this law the direction of the force vector is the same as the direction of the acceleration vector.
And the third law:

III. For every action there is an equal and opposite reaction.

Ruben found all this very interesting and we had a great conversation about gravity and the apple falling on Newton's head...

Here is our experiment: The bottom section of the rocket we put bicarbonate of soda (baking soda), then Ruben filled up the rocket 1/3 with vinegar.

Then it was time to give it all a very gentle shake, 2-3 times.


Outside we went as the instructions said it could reach 50 metres high, not reading this first it was Bailey who said "Mum, your going to need to get that outside!". Good job one of us had read the instructions thoroughly...

So we waited patiently whilst the rocket did....NOTHING!! Back inside and I put it in the sink to wash out and it exploded all over me much to all four children's delight :-) Not the best thing to happen in a belfast sink either but never mind.

Attempt number two went so, so , so much better and it did soar really high. Sadly it was far to quick to get a photo of :-(, we lost one of the rockets wings in a bush too.

Another two more attempts saw it flying into the bottom of the garden wall and exploding in Cordelia's hand, no one smelt very good that afternoon! Seems to have triggered the scientist in all of them now though....


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