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You can share by writing your post, uploading an image of your design sketch and prototype, or using the video recording feature to share your work for these phases of the engineering design process.

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1. Click the circle with the plus sign under a column.
2. Click on the 3 horizontal dots.
3. Select upload to select a saved image to your computer.
4. Select  voice to record your post.
5. Select film to record a video.

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It's kinda big to travel down a ramp, but has enough mass that, with a small force, would make it open the door??

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The towel will be whisked out of the way and at the same time a tap from the vacuum will move the yoga ball toward the door!...Not quite as elaborate or true to Goldberg as I'd like but short on time!

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This definitely needs to be more complicated to be viable as a Goldberg-like experiment but it was fun! I tried with my initial 8lb weight idea and almost broke the door...

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My design started with a large fan, a ramp made from a temporary speed bump that we have in the garage, a softball, and then of course the door. Even with the large fan, it had a difficult time moving the softball. But it worked. Kind of.

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I start with a hot wheel car on a track on a table, it triggers dominoes on a wooden chair, that triggers a baseball down a ramp, which hits a book and closes the door.

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I started with a chair with a rolled yoga mat propped up (like a ramp), then I have a can to drop down the ramp, which will push a baseball to open the door.

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Book will stand balanced, roll water bottles to knock it down and open door

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A ramp made of books, a moveable lego block holding up the basketball on the ramp. a string attached to the astromech droid and the lego block. drive the astromech droid to me moving the lego block and letting the basketball go.

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A ramp made of books, a moveable lego block holding up the basketball on the ramp. a string attached to the astromech droid and the lego block. drive the astromech droid to me moving the lego block and letting the basketball go.

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Looks like it might work, book might not be heavy enough.

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Line up the ramp, block and broom with the door.  Roll the ball down the ramp.  The ball hits the block and the block pushes the broom which moves the door.

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Line up the ramp, block and broom with the door.  Roll the ball down the ramp.  The ball hits the block and the block pushes the broom which moves the door.

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Substituted basketball for baseball which allowed me to use a bigger book.

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The yoga mat, can, and baseball worked to push open the door (a bit).

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Ruler: to measure the 12 cm
Brick: to place at the 12 cm mark
Remote control car: to drive the car to push door until door hits brick

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I'll attach the leash to my door and tie it to my ironing board. I'll put the snack near the ironing board and hope my dog will jump and tilt the board. The tilt should push the door open. 

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I'll attach the leash to my door and tie it to my ironing board. I'll put the snack near the ironing board and hope my dog will jump and tilt the board. The tilt should push the door open. 

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Don't have materials but invision somthing like this.

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These test visuals are soo great!!!

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I decided that I would be using a shoe, my lonely, dusty guitar in its case, and my drawers in my bedroom. I would put the standing guitar + case in in front of the door. Then, I would tie my shoe onto something and use the drawers to keep it open. As soon as I clothes the drawer, the shoe would swing, hit the guitar which would then tilt to fall and close the door :)

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I will need two setups, one on each side to open or close the door...and NO door handle allowed! :)

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If I had the time I would add a ramp

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As drawn.

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Hope it works!

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worked perfectly every time I tried it in my mind. A blue bowling ball might work better.

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Use calculations to be precise in your movement of the door. Inquiry, engineering practice as well collaboration needs to be implemented

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I used books like dominoes to close a door.

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I order books from light to heavy in front of a door. Th foam roller will be what I use to initiate the chain reaction.

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Very simple (definitely not a true Rube Goldberg experiment) but effective:

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Open door 30 cm. Place large books upright slightly apart from each other then tap last book in line causing books to fall in sequence, the last striking the door causing it to close.

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simple, but should work

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I decided to use a pinewood car (which does fit under the door) rolling down a ramp and pulling a ruler behind it to open the door. Held together by clips and tape.

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The car didn't have enough velocity it seems to pull the ruler. I think that means I need more potential energy to get more kinetic out of it. I don't think I have a way to reduce friction. I'll try a higher, longer ramp

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Prototype. Will use water bottle as ball. Much heavier then a tennis ball. 

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Prototype. Will use water bottle as ball. Much heavier then a tennis ball. 

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Start with bowling ball on the cat tree. Roll ball down inside of broken laundry basket. Ball rolls across the floor and hits the door, causing it to swing open. 

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Start with bowling ball on the cat tree. Roll ball down inside of broken laundry basket. Ball rolls across the floor and hits the door, causing it to swing open. 

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The experiment worked.

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Bowling ball stops at the end of the ramp. 

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Bowling ball stops at the end of the ramp. 

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Bowling ball stops at the end of the ramp. Extended ramp using ironing board. 

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Bowling ball stops at the end of the ramp. Extended ramp using ironing board. 

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Dominoes
Not the pizza lol
Carefully line up some dominoes, books, with rulers for ramps and solo cups to set them on. Maybe a balloon could pop at the end.

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I started with a cutting board as a ramp.  I needed something heavy to roll down the ramp.  I used a water bottle.  I used a step stool to hold up the ramp and a magazine to kee the ramp from sliding off.  I
balanced the bottle on the magazine with a string cheese sticking out one side.  The dog grabbed the cheese which pushed the bottle down the ramp.