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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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#1 - Ball on top of magazine, when touched rolls forward and off magazines, #2 - knocking over paperback book that falls forward, #3 - book falls on dog that jumps up, hitting the door. ;)

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It was a fail :(

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Success!

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I will wrap a cord around the doorknob and the show, I will throw the pillow at the cord between the doorknob and the shoe. The cord will tighten, letting the door close due to its insufficient wait.

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Bin lid as ramp, tennis ball goes down and broom stick used to keep tennis ball on track to hit foam roller which is supposed to fall and close door.

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After testing multiple times with multiple items, here's the set up that was successful and I was able to repeat it! I had to bring the ramp closer, change the type of ball and change the foam roller to a book.

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Tip over a series of chairs to push a bowling ball down the ramp, which then hits a balanced chair tied to the door.  Then the chair begins to fall it will pull the door shut

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Tip over a series of chairs to push a bowling ball down the ramp, which then hits a balanced chair tied to the door.  Then the chair begins to fall it will pull the door shut

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Step 1: Close door
Step 2: Place Ping Pong balls in empty cup.
Step 3: Turn on sink and fill cup with water.
Step 4: Cat is attracted to running water and the sound of ping pong balls once they overfill.
Step 5: Cat runs through door.

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I had to complete change my idea from sketch to prototype because I thought I had a lot of cardboard in my garage, but I didn't, so I utilized books and a chair instead.

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Cat is asleep and does not care about my problems.

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It worked until I got the camera out I promise ;)

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Or thermocouple using water instead of sunlight:
https://www.youtube.com/watch?v=CtuUBZC1jaM

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Small fans powered directly by solar panel

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Roll a yoga mat to knock over books and open the door.

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I set a chair leveraged on a wood piece. The chair tips over and hits a basketball that hits a book that falls and closes the door. 

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I set a chair leveraged on a wood piece. The chair tips over and hits a basketball that hits a book that falls and closes the door. 

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Yoga mat, DVD player box, some good books, and a weight!

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Attach a fly swatter to the lever (moving arm) on a mousetrap. Set up a basketball next to a ramp just near enough to the mousetrap so the ball is hit. Once the trap is activated, the flyswatter will smack the ball and have it roll down the ramp to close (move) the door at least 15 cm.

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It worked!

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Okay so I have a wooden door that is kind of heavy, and I need to move it a minimum of 15 cm.

The objects can be random and easy, but I need something that has enough mass so that when it does move to shut the door, there is enough momentum.

Probably... a basketball? But I need it to have a high enough velocity as it moves toward the door to shut it. Meaning employing a ramp of some sort?

And to build up the number of items, I can maybe have it move off the ramp using books or something.

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It did not work the first few times, but I just changed the position of the items and SUCCESS

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I think I needed a less dented cardboard piece. Side note: I always wanted to do this as a kid and this is the first time I do it and it's just as fun as I thought it would be.

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Chair, ladder, exercise ball and beautiful assistant 

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Chair, ladder, exercise ball and beautiful assistant 

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Chair, ladder, exercise ball and beautiful assistant 