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Ravensburger 27603 GraviTrax Catapult Accessory-Marble Run & Construction Toy & 27599 GraviTrax Loop Accessory-Marble Run & Construction Toy for Kids Age 8 Years and up-English Version

£9.9£99Clearance
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The Lifter worked perfectly every time we used it, although you need to remember to operate it manually, unlike most of the other expansions featured here. This one is great when it works well but getting to that point is highly frustrating, even for adults, and younger kids will almost certainly give up on it before the fun can start.

How fast the rollercoaster is going is worked out by working out the velocity – which is the change in acceleration over time. You work this out by taking the acceleration (which is the change in speed over time) and dividing it by time. Ravensburger sent my ten-year-old son and me six of the latest GraviTrax expansions to try out. We rated them over four different features as follows: We then put into practice what we had learned about rollercoasters using the Gravitrax add-ons by making our own out of junk materials. The Gravitrax Expansion Catapult allows further development of STEM through trial and error, plus some discussion. We experimented with varying the height of the catapult: We wanted to determine whether the higher the balls are flung from has any effect on how high has and/or far they will travel to get over an obstacle. To see how far the ball went we measured it in terms of tiles it passed; and for height we built a tower that is crashed into, lower it a tile at a time to determine when it could pass. Of course the answer is yes – the higher you place your catapult the higher and further the ball will travel. The set comes with a large book of construction plans, graded by difficulty level. When you are familiar with the different pieces and how they fit together you can move onto the tasks. These ask you to complete layouts by solving a variety of challenges which are graded by difficulty, for example working out how many height tiles you need to add or which elements are missing.

One Scoop Piece (in seven pieces – this is the only expansion that requires significant construction before first use) GraviTrax is a toy I love and will recommend again and again, and these expansions will serve to make it even better. The Lifter expansion, as might be obvious from the name, lifts marbles vertically to three different levels depending on how many pieces you use to build it. It needs to be manually operated each time by a button and can send marbles in different directions at the top. What’s in the Box? The Flip is a lot of fun to watch. I think it was probably my favorite of all the GraviTrax expansions so far.

Despite its enthusiasm, the Scoop is remarkably consistent and worked perfectly every time we tried it. The Scoop expansion scoops the ball up and flips it over to the next section, carrying on in the same direction. What’s in the Box?Consistency: How consistently did each expansion do what it was supposed to do? For this, we used each piece 10 times in an identical setup and recorded how often it worked correctly. We also talked about the Gravitrax Expansion Catapult in terms of density – thinking about what would happen if the balls had been designed lighter. We came to the conclusion that they would not have travelled as fast or as far. This resulted us in thinking about weight restrictions on rollercoasters. The Gravitrax Add-Ons: Action Loop Add-on

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