A beautiful demo with students timing with stopwatches.
I typically do this around bonfire night, but if you buy some rockets (the banging type) you can do this anytime.
You really need a school playing field with no sports or the like going on.
Wedge the wooden stick of the rocket (any size will do) into the ground in one corner of the field, get students with stopwatches as far away from the rocket as poss (yes for safety..but more importantly the further the better results you get)
YOU light the rocket and let students 200/300m away know that by usual jumpimg up and down or arm waving...students prepare to start stopwatches as soon as they see the FLASH (on the ground because the rocket is wedged into the ground)...the sound of course eerily does not get heard until a second or so later.
Do this as many times as you have rockets, all results can be pooled and averaged later on.
There is scope for this demo to be done a mile or 2 apart..using mobile phones and taking students to a nearby park..the rocket is released and explodes high up above school field...students do the timing thing from as far away as is practicable...Google maps will give you an accurate distance to calculate speed of sound should you wish
I typically do this around bonfire night, but if you buy some rockets (the banging type) you can do this anytime.
You really need a school playing field with no sports or the like going on.
Wedge the wooden stick of the rocket (any size will do) into the ground in one corner of the field, get students with stopwatches as far away from the rocket as poss (yes for safety..but more importantly the further the better results you get)
YOU light the rocket and let students 200/300m away know that by usual jumpimg up and down or arm waving...students prepare to start stopwatches as soon as they see the FLASH (on the ground because the rocket is wedged into the ground)...the sound of course eerily does not get heard until a second or so later.
Do this as many times as you have rockets, all results can be pooled and averaged later on.
There is scope for this demo to be done a mile or 2 apart..using mobile phones and taking students to a nearby park..the rocket is released and explodes high up above school field...students do the timing thing from as far away as is practicable...Google maps will give you an accurate distance to calculate speed of sound should you wish
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£3.00