The Mentos Geyser Rocket Car is a great visual tool as well as hands-on demonstration of valuable lessons in physics and motion as well as physical reactions. The included experiment and activity guide will also supply young scientists with great ideas for possible science fair experiments. The Mentos Geyser Rocket Car demonstrates Newton's Third Law of Motion. The Third Law states: "For every action, there is an equal and opposite reaction." So when the Mentos geyser erupts out of the 2-liter bottle in one direction (action), the car rockets off in the other direction (reaction)! In addition to the great physics lesson, you'll also get the same hands-on experience of nucleation sites, pressure, and experimentation that you get from the original Mentos Geyser.
Science Fair Connection:
Launching a Geyser Rocket Car isn't, by itself, a science fair project. There are some very easy ways to make experimenting with the Geyser Rocket Car a great science fair project, though. The key to creating an awesome science fair project is isolating a variable. A variable is a component of the experiment that changes and, hopefully, alters the experiment. Some examples of possible variables with the Mentos Geyser include:
These are just examples of variations that you can try to turn the Geyser Rocket Car into a science fair project. Remember, you have to keep all other factors the same. If you're testing different brands of soda, make sure the number of Mentos you use is always the same and that the sodas are kept at the same temperature.
We purchased this for a 4-H group science experiment. The kids were excited all week for our "exploding rocket car." We were so disappointed when we loaded the car and stepped away only to hear disappointing sighs and comments about how "this was supposed to be fun."
As the leader of this event, I was embarrassed that I had prepared a lesson that didn't work as suggested. Our club has already purchased a Steve Spangler science kit for each of our monthly meetings THIS YEAR. I hope that the other kits are better than this one, as I am trying to get the kids interested in science, not disappoint them with experiments that turn out to be less than "cool."
We followed the directions completely, several times, with no luck. We were on a smooth pavement surface, and we even experimented with more/less mentos, still... the car had little to no movement. I would NOT recommend this product. We did however use the traditional geyser tubes to save the day. They work great! Just stick to the traditional tubes, you'll be glad you did. I'll continue to review each kit as we work through them. Don't fail me Steve Spangler, I had such high hopes for your kits, and have promoted these fun science days with our kids like crazy. Keeping our fingers crossed that we have better success next month with your Halloween party kit.
I do a lot of science with my 8-9 year old grand son. This is by far the best science item we have ever bought. Yes, the car is not much but it does work and the Mentos are kind of lame but it can lead to so much more !!!<br />
Go to "water car rockets" on YouTube and see all of the action. Basically, after you get the hang of using the Mentos you can put a wine cork in the bottle and pump pressure in using a tire pump. THEN IT REALLY GOES. After several days of experiments & refinements he had a launch that BLEW THE WHEELS 3/4 of the way down the drive way. He has been hooked on science ever since and is still experimenting. The wheels went back on and the car is still in use.<br />
Go to a dollar store & buy soda bottle for $1.00.<br />
Steve S. should consider volume discounts on price for birthday parties.
Perhaps our pavement was too rough, but I thought the car would travel well, as it appears to be on a similar surface to those Steve has used in his videos. The soda simply shot out of the end of the car, not propelling it forward. An epic fail when you're trying to wow kids!</p>
<span style="color:#00f;">Brooke,<br />
That definitely should not happen with the Geyser Rocket Car! One of our customer service representatives will be contacting you very soon in order to troubleshoot the problem.<br />
-Steve Spangler Science Web Team</span></p>
I got this car for an after-school science class and it was awesome! The cars really shot off and went the full length of the playground (>50 feet) and crashed into a wall. They don't always go straight which adds to the fun. My only complaint is that this product is (in my opinion) overpriced. The only parts you really need are the wheels/chassis and the mentos launcher. A smaller price tag would be much easier to swallow, especially since you have to buy the soda and mentos for multiple uses.</p>
My grandson and I had a ball with this car! Hopefully, it will work well with off brand soda!!!!
WOOHOO!! I love it -- the students loved it! What a way to show Third Law of Motion.
We bought 9 of these kits at our local toy store for our son's 8th birthday party. It was fun, the kids had a literal blast and they were excited and entertained the whole time. There are a few things I wish I had known:<br />
1. You have to hold the bottle upright, drop the mentos, COUNT TO 2 and then lay the car down to go. If you don't do that the mentos don't drop to the very bottom and the car doesn't go as far.<br />
2. We did this on our street. Car didn't go more than 30 feet. <br />
3. If you are doing this on a street or sidewalk, always use the maximum amount of mentos or the car really doesn't go far and you waste a bottle of soda.<br />
4. It takes kids lots of practice to get the timing just right. We had 4 bottles of soda per child and that wasn't really enough.<br />
5. We tried and tried and followed directions well but we could never get the car to go more than 3 feet with water and an air pump. If that would have worked well I would have given this toy 5 stars.<br />