I like more the effect of the wooden toy shown before it, but if you are not convinced in making it, this papercraft one should be easy enough to start with. For the record, the Woodpecker toy consists of a rod (static) on which a sleeve (ring) is connected. because though you should end up with equivalent solutions from all methods, it's frequently found that one of them gives you a particularly easy procedure. The instructions on the linked page are really good and detailed and don't forget there are free patterns you can use.

Of course you can't use it to produce toys commercially, but I guess no one will go after you for making one toy for your own use. We made the woodpeckers this morning, and I wrote about it and posted a little video over on my blog at http://r8chel.I have collected some of the greatest classics and made sure there are some kind of how-to-make instructions for each of them. Also they have different variables: Lagrange only generalized coordinates/velocities and the Hamiltonian a generalized momentum variable. Yet, there are some adjustments that can be made, such as how tight or loose you stretch the rubber band, and what angle you hold it, that have an effect on how the bird moves, making it interesting for older kids and adults too. Also, my daughter kept letting go of the rubber band after the bird landed, so I tied some beads onto each end of the rubber band to keep it from falling out of the straw. e. there is a cycle of jammed and unjammed motions that repeats, with the same time interval and the same vertical drop down the pole for each repetition.

Since friction, slip and stick are hard to model, I am thinking of starting with a rod that only has stiction, and then move on to the more realistic case you pointed out. If you’d like, you can use the dotted lines and fold the paper in half lengthwise so you can cut both sides of the bird out at once. Now I am not going to go into details about the model or justify this approach, I am just trying to understand the equations of motion for the woodpecker during different stages of its path down the road. Estoy guardando tus ideas para cuando mi hija sea un poco mayor (ahora tiene 19 meses), pero no he podido resistirme a hacer el pájaro carpintero. Joel from Made by Joel created his beautiful woodpecker printable and now gives us another colourful printable bird.hace tiempo que te sigo y quería agradecerte todas las ideas que nos das, y felicitarte por el blog, tu imaginación, tu arte y tu generosidad. Kyle Kanos and Chair: Firstly I am intrested in how to derive them, that was the question, because now I really don't have an idea why the equations hold.

The tumbling acrobat consists of an action figure and two small bars, and he flips over when you squeeze and release the poles. For more detailed instructions and to learn the physics of how this works, check out the Science Toy Maker post here.A more realistic model might include using Coulomb friction to model the vertical friction force on the pole as a function of the reaction forces on the ring. El mío picotea mejor cabeza abajo que hacia arriba, pero he disfrutado mucho haciéndolo, me encanta jugar con él. BUT … all of the above is an over-simplification, because it ignores the relative vertical motion of the bird and the ring!