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Barely did anything, part fail + down my stairs causing trouble while positioning.
Path of straws + tape (pencil goes down) Book chain knocked down. Last book goes down slide. Hits toy truck Nudges moving marble pendulum thingy (don't know how to describe it) ( marble thingy is unbalanced and when slightly nudged will swing back in place. Pencil attached to that.

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i didnt do alot but i got some down.This took me a long time and it was really hot so i needed to hurry up.

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I got 5 steps and I just did dominos with 5 different materials(1 domino, 1 pencil sharpener, 1 eraser. a pokemon card and 1 poster paper to turn on the lights.

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I've got 14 steps, number 1 is a track, then number 2 is a short piece of PVC pipe, then step 3 is a long curved track, then step 4 is a long tube, and then step 5 is marbles that are in the long tube. Then step 6 is a net that the marbles can go through that is on the end of the long tube, then step 7 is a piece of vellum is on the end of the long tube keeping the marbles in the tube, and is able to be removed with enough force.

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i was to lazy to do a video so what i did was i had books like dominoes all done my hall way and when one the last one fell it hit a blower a ball flew out then hit a actual domino then that same idea went to the kitchen and i was laying there but when the last domino fell it pulled a fruit snack in my mouth and that was it

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Mine broke after I built it and I couldn't really build it back after 4 tries, and the timing wasn't working out at all, so I made an animation to sort of show what would have happened.

My contraption is supposed to have a bunch of books in a row, and they will fall down like a domino effect by using a baseball roll into the books. It will be able to catch the charging cable so it won't slide away and off the table.

(My video was super short lol)

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I used a ramp to roll the the farthest. Also used multiple balls to make the other ones rolls.

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This the link to my video:
https://drive.google.com/file/d/1F1DFi0ZFPFi53Ni4K4NTLklN6kbXloCl/view?usp=sharing
My machine had 3 or 4 steps and I made more steps for my second design. My machine pushed a pencil taped to a car to go far(not that though).

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Thing kept on falling done but my steps were that a string got pulled and a ball rolled down, Went to the left did a loop upside down and went under the build. Then land on my cats nack with tape, I would tell my cat to go to the room. AND thats my distance.

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My machine failed after attempting to add more steps and now I can't really fix it but the steps were I pulled the string which released a ball, the ball rolled down a ramp hitting a cup which had a ball inside which went forward, knocked down the books and turned the light off after the final book landed.

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I had to put my video on a different page

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My machine ended up having 10 steps in my whole design, I added three more steps to my design for the second test, It took 1 hour and 30 minutes just to work once, My final task was for the pencil to get launched by the rat trap. my final thoughts is that I was really happy with my overall design

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i had to use my hand and my brothers were doing something else so i had to do this but it went was planed

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i cant get a video so here is a picture

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Mines really short but and im sorry for the noise when the dryer set off

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The first time my machine went it didn't work so well, but the second it did a lot better. My first attempt was 5 steps and my second was 7 steps. My final was to push a pencil as far away as possible.

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sadly the cleaners broke mine but all my info is in this video.

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So the first design i just had the design but without the domino's knocking down the marble and that worked the first time. but the second design it took a whole bottle of toothpaste to get right and I didn't press record the one time it worked because Im stupid, but the domino's are supposed to push the marble and then the marble is supposed to knock over the books and put more weight on the box of domino's and a five pound weight which is on top of the toothpaste and the toothpaste is on top of the tooth brush.

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My machine failed. The last part of my machine didn't work and because of that, I wasn't able to get to the modification stage. I attempted for 5 steps.

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This was my second attempt it took be 5 stages. (My dad walked across the face of the camera before I ended the video)

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My first try the sides flopped and the nickle just bounced off, then I added hot glue to make the sides stiff.  (its really bad)

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The Rube Goldberg machine was really difficult even to do a simple task like moving a pencil, but overall it was still really fun and interesting to think like an engineer. My machine has about 8 steps and overall I thin, if I were to make this again, I would definitely think it through more. I had five steps at first but then I added 3 more steps. My final task was the pencil falling of a chair and rolling of a poker box then rolling on the ground for a while because of the impact leftover.

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sorry I cant get a video but this is how it works. it slides down some books then down a tape bridge, then falls into a book, then goes into a funnel then down a longer tape bridge into a cup

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Mine was able to do 8 stages. First was the books fell down, then it hit a basketball, the basketball rolled and hit a ping pong hitting thingy, the ping pong hitter hit a domino, the dominoes all fell, one domino hit a cup with a ping pong pall, the ping pong ball hit the other domino, it hit the ping pong hitter, and finally it hit more books with the pencil falling in a cup. I took a picture cause' I hit the book with my leg on accident...... My Bad.

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I managed to get 7 stages in all and the final product was my machine moving a pencil. I think that my machine worked well but something to consider is in the future to make longer steps instead of making a very compact build. I was able to add 2 more stages from my original design.

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https://drive.google.com/file/d/1-t5qbGaa9c3HmcKthBCxOpY9vgkRpp3B/view

The machine had about 6 stages.
When we were building we managed to make more stages in the process between the first and second build.
The finnal task was when we shot the pencil from a lego crossbow.

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I did manage to make more stages in my second design it took me around 10 tries.

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itś not working

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it took me 7 tries to do this

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it took me 3 tries to do this.

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first design contained 5 steps then I switched things up then it worked a little better.
https://drive.google.com/file/d/1-FAip-xp-jYsmyooSrn7AoRfNYeF4npi/view?usp=sharing

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my first design contained 6 steps but then for my second design i added 4 more steps. there was one at the beginning and 3 at the end. the task it was supposed to do was fling the egg and crack it.

this is the link to my first design
https://drive.google.com/file/d/19P49G0bo9y6QEhF4i9-nIcGXJQ6aE0-i/view?usp=sharing

this is the link to my second design
https://drive.google.com/file/d/1ER5_gEBaE79InSSlZTBHjjY5qE5qWeEu/view?usp=sharing

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i accidently make it all fall down. But the marble would go on these funnel things and would go onto the books. Then it would have gone onto a train track and push a pencil a few inches.

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My first one had 4 stages then I added 2 stages and the final task was make a pencil roll.

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The first machine I made was a dog sqeeker but then for the upgraded version I just changed the hole thing and made tea.

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I made 5 stages,added and it ended with a machine that made the pencil move.

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I had 5 stages at first then added 2 things which made 1 (2)? stages to a machine to push a pencil.

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at first my machine didn't work very well so i had  to
add a few parts that made it work
it kind of failed so i had to kick the book

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At first I had two stages. For the second I had seven stages. To add more stages between the first one and the second one I added stages to the beginning. I kept the end mostly the same except I changed how the marble pushes the dog food release.