These look great! Excellent work. I have a couple of these plans, and I intended to download the others, however it looks like the rbguns site is no longer working. I would love to build these for my son this Christmas, curious if you have some of the pdf to share?
Thanks for posting your work for us to see. I have reproduced all the items in catalogue for my pleasure. Your items are fantastic. Someone out there who knows where I could buy already made Winchester and Colt single action??? The RGguns shop no longer sells them. Some designs use cardboard for wheels, some use CDs.
These rubber band car designs encourage children to ask questions about transfer of energy, observe, analyze, and share their findings.
You will need to make a catch to hold the rubber band on the rear axle. You will need putty or clay to make sure the wheels are firmly attached to the axles, not spinning. Your car needs to be designed so that you have a way to wind up the rubber band and it can freely unwind when you let the car go.
When trying the rubber band car activity, I always encourage children to make it into an experiment. There are several areas where variables can be changed. Wheels: Try cutting cardboard circles or use CDs. What other objects could be used for wheels? Car body: Use corrugated cardboard the channels are a good size for skewer axles.
Try an empty water bottle or a small cereal box. Toothpicks, straws and bottle caps constitute this unique design of rubber band race car. On twisting the rubber band around the axle, you are storing potential energy in it that gets transformed into kinetic energy when you let it go.
The rubber band unwinds to regain its former configuration spinning the axle and propelling the car forward in the process. Hence, the more the winds of the rubber band, the faster and longer your drive. It works on the principle of conservation of energy that energy can neither be created nor destroyed, or the total energy in an isolated system remains constant.
Instead of cardboard, the cars can use a variety of lightweight materials for the chassis such as Lego, balsa wood, light plastic container, cereal box or foam board. Wooden dowels threaded through straws work well as the axle.
Listed below are a range of design ideas that you can choose from. It would be a good idea to draw a blueprint of the desired plan on paper before starting off if children are doing it in the school lab or performing at a science fair. The amazing car project is going to get the kids hooked on to their models for hours. Though it might need a bit of trial and error at first, once they are comfortable with the steps they can design a good car pretty quickly.
The project sheet can be used as a teaching aide for students in grades 5 and up. For grades 4 and under, I recommend showing how to build the car step-by-step, and then use the project sheet as a reminder of the steps. Print out one project sheet for every 2 students.
Thanks for reading this far! Reply 1 year ago. Very nice. Will have to try this with my grandchildren. The reason you want the added weight on the wheels is because it will increase their angular momentum and keep them turning ie pushing the car longer. Basically, fly wheels. Weight will be more effective if it is added as close as feasible to the rim far from the axle.
Of course the wheels need to be well balanced the weight distributed symmetrically. A good way to do this is by adding equal weights to each of the spokes. More by the author:. About: I'm a writer, maker, and educator who's on a mission to better the world through hands-on engineering projects. Check out my work: www. Create a frame that's 2 craft sticks long as shown picture 1. Hitch the rubber band onto the drive wheel dowel picture 1. However, if you want to specialize the car for either speed or distance, then read on: Designing for Speed The car takes time to reach maximum speed because of inertia.
Inertia is the tendency for an object to resist change in motion. Heavier, more massive objects have more inertia and require more energy to start moving. In this case, any excess weight requires extra energy to move before the car can reach top speed.
Therefore, to make a speedy car, it must be as light as possible. To that end, you can change out the idle wheels with small wheels picture 1 , or experiment with reducing some of the materials used in the frame. The drive wheels must remain large; small wheels have too little inertia, and will spin in place when the car is released instead of gripping the floor and propelling the car forward.
Furthermore, you can experiment with using more than 1 rubber band.
0コメント