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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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I would attach some rope to the ceiling with a spot to put a log in with nails and a hammer. I would swing the log toward the door to close it.

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I have a couple of books standing up in front of the slightly ajar door. I am going to roll my 4 year old nephew's basketball at them.

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Built my prototype, but doesn't look like the cooler will be tall enough to allow for the ball to bounce off the top of the toilet paper roll pack - will see result when I test!

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I started out with books that were too small, so I had to change to larger size books. When I read the directions the first time, I thought we had to use five objects. I am having trouble getting a couple of the books to stay standing, so when I do my final run, I may only have 2 books standing. The door will close with 2 or 3 books.

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Cooler definitely not tall enough - added a pack of water underneath and created the height that I needed. Door was able to swing open!

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Need a taller ramp for more force applied to broom.

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Prototype does not look half bad! It is a very good think I have large books!

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Put some additional books under board that ramp is made with, the adjusted broom angles. It closed the door.

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It worked! It took 2 books as opposed to 1 in my original plan.

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Have water bottle on top of table, gets knocked over, falles onto incline made by two kayak paddles and pushes soccer ball down paddles to roll and close the door

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End table and ramp were set up but my bucket was too high at the beginning. After adjusting the bucket it worked well. Had to lengthen the string to make sure that I met the parameters.

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Make sure kayak paddles are not spaced too far apart, incline ramp made with paddles. more force behind water bottle to initiate motion

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After adjusting bucket height and string length, it worked well.

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I started with books stacked up approximately 1 meter.  I then placed a hot wheels track at the top leading down to another stack of books.

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I started with books stacked up approximately 1 meter.  I then placed a hot wheels track at the top leading down to another stack of books.

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I placed the can opener below the second stack and rolled a lacrosse ball down the track.  It took several trials to make the ball drop on the lever of the can opener but once I solved that my plan work perfectly.  When the can was placed in the can opener with the lever almost engaged the ball started the can opener and true to form my cat came busting through the door opening it 37cm

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Difficult to get the books to stay upright long enough for set up. Opened them slightly to have them be sturdy enough for set up.

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Baby pushes ball, ball rolls down ramp into door for the desired distance!!

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Baby pushes ball, ball rolls down ramp into door for the desired distance!!

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Baby pushed ball, ball rolls sown ramp into door for the desired distance!!

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Built prototype using 2 medium sized amazon boxes, some scrap wood and a basketball.

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Built prototype using 2 medium sized amazon boxes, some scrap wood and a basketball.

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Needed to have the ball up higher for more force, so added an additional amazon box. Worked perfectly!!

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I will be using a clamp attached to the end of a broom handle. I will close the clamp on the side of the door and use good old human strength to swing the door in the direction of opening or closing. Momentum and force with take care of the rest.

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If I had wind up cars, I would use those and string.....but, since I don't, I would use a cookie sheet, small box, and my dog's ball (it's kind of small, but heavy)

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Lit tea light sits on floating plastic bowl. The sink is turned on, and slowly fills, lifting the floating bowl and tea light. The light reaches the top, where it burns a string that is holding a car at the top of ramp. Once the string breaks, the car rolls down the ramp into the door and causes it to move. 

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Lit tea light sits on floating plastic bowl. The sink is turned on, and slowly fills, lifting the floating bowl and tea light. The light reaches the top, where it burns a string that is holding a car at the top of ramp. Once the string breaks, the car rolls down the ramp into the door and causes it to move. 

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The prototype filled the sink too quickly, so we changed it out for a titration pipette and let a plastic container fill more slowly to keep the candle upright. 

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The prototype filled the sink too quickly, so we changed it out for a titration pipette and let a plastic container fill more slowly to keep the candle upright. 

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my original idea was terrible.   It was impossible to get the tongs to attach to the tripod to create a slingshot.  So I had to redesign.
My redesign included using a shoe, dropping it on the opening mechanism for my trash can, and lean a broom against the trash can. when the trash can opens it pushes the broom against the door to open it.

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It worked! Next time I want to try incorporating a series of blocks or something that fall down into the door after being hit by the car. 

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It worked! Next time I want to try incorporating a series of blocks or something that fall down into the door after being hit by the car. 

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kick soccer ball through the door and it will go up ramp and hit the weight which will fall and the string will close the door.

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The first attempt did not have a way to move the weight and it kept falling in the wrong direction. I attempted to change the direction of the ramp and that too failed. I realized that the wight needed a counter force to move in the right direction.

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It worked with the door closing 15 cm when I added the counter weight.

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With a few small modifications, my redesigned prototype worked! I had to add some weight to the broom to make it heavy enough to move the door, but it worked.

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Built my prototype using a chair and piece of heavy cardboard. I secured my ramp using books on the chair.

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I built the basic set up as shown in my design sketch. I didn't measure anything to make it reproducible.

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The first attempt I did not leave myself enough room to get the ball all the way to the door.

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The ball is not heavy enough to knock over the noisy toy.

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The kid's ball was not heavy enough to shut the doors. I had to use my weighted workout ball. Then the ramp wanted to fall over from the weight of the ball. I had to secure the ramp with more books on each side and my child's hands.

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I re-evaluated my distance and this time I got it to open but I still need to figure out how to only make it only open to the appropriate distance.

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set up table with large picture as inclined plane.  Roll soccer ball down the ramp to hit door.

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Set up a bar stool with two broomsticks as a ramp, and roll a basketball down it into the door.

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first attempt table was not tall enough to create steep enough inclined plane for soccer ball to gain enough speed to hit door hard enough to move it 15cm.

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In my device, a tea kettle will whistle which will frighten the mouse that lives under my stove. She will run out in fear and notice the adorable mouse house I have strategically placed for her atop a ramp. Fearing for her life, she will shove the ping-pong ball blocking the doorway down a ramp, causing it to tap a precariously balanced broom. This broom will then fall into a soccer ball atop an adjacent ramp, causing it to bump into the door and open it approximately 15 centimetres.

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I tried to locate our little mouse, but she seems to be taking a nap. Once I have assured she is in position, I will report back my findings.

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I built my prototype and realized that my house is really tilted. All of the doors facing north automatically open if they're not latched.

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It didn't move very far the first time, so I swapped the brooms so that the bristles were at the top instead of the bottom. It definitely helped, but I was still only able to get the door to move 12-14 cm.

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I started out with 3 objects. I used a board, tennis ball and dr.pepper box. My idea is that I will have my daughter ride her scooter/car past the tennis ball, it will roll down the ramp causing the door to close.

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The door didn't close. I don't think the tennis ball has enough weight to it and my incline needs to be steeper.

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Still waiting on the cat...probably have to go to bed before he'll do it

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Still waiting on the cat...probably have to go to bed before he'll do it

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It worked! I used the potato gun to aim at the electric car remote control and it caused the car to reverse thus pulling on the string. This almost closed the door but the car did not have enough strength

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As mentioned before it almost closed the door all the way