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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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If I had these items (today is literally my move out date and I have nothing in the apartment except a vaccum) you could have some sort of ramp set up ( some surface to start off a ball) then you could guide it using pens or pencils down a pathway to the door. Once the ball rolls down this pathway it will hit the door and open it.

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I had to get a much larger object than that ball to make it work! I am currently making a chest which is why its a lot of unfinished stuff! Excuse my nosy pets.

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Have a weight that pulls on a pulley attached to a rope that pulls the handle to open door- if rope pulls then it will pull it open

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I tried video taping my tests, but I just caught the end where I was picking up the items. I tried like 6 different times, with different objects I have around. I have figured out that my doors do not close very easily, and that I do not have a lot of heavy objects to be able to use to hit it with enough force to move it more than like 3 cm.

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Define the Problem:
Need to move a door by a minimum of 15 cm
Identify Constraints and Criteria:
Constraints: Time (20 min.) and Materials (3-5 objects)
Criteria:  Must use 3-5 objects, Design must be labeled to show thinking, Door must move 15 cm, Easy to reproduce
Brainstorm:
materials: remote control dump truck, rope, duct tape, measuring tape
ideas: tie the rope to the dump truck and to the door. Measure the distance the door needs to move. place a piece of duct tape as a marker on the floor. Drive the toy truck toward the tape until the door has opened the appropriate amount.

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Used ruler to measure 15 cm from door. Had to adjust height of mirror ramp 5 times before the soccer ball moved the door exactly 15 cm.

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I couldn't exactly get a picture of my dog on the other side of the door, but I cracked my door open and yelled treat. My air conditioner will shut my door so I turned that off so it would not be a variable. Watch the video in test to see if it worked out.

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Sketch

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There is a wall that makes it hard to see how open the door is, but it was 16 cm. I used 3 objects: me, my dog, and a treat. Guest appearances made by my cat and bearded dragon.

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Skateboard hit the soccer ball, soccer ball rolls down the stairs, and hits the awkward from door the blocks the stairs when the door is open.  Someone designed the house without the EDP!

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Skateboard hit the soccer ball, soccer ball rolls down the stairs, and hits the awkward from door the blocks the stairs when the door is open.  Someone designed the house without the EDP!

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They skipped the prototype.

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Skateboard hit the soccer ball, soccer ball rolls down the stairs, and hits the awkward from door the blocks the stairs when the door is open.  Someone designed the house without the EDP!

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One thing to note is that I have a puppy... he is still learning basic commands and I thought he would love to pull on the rope. I'm not sure he understood his task, but he did enjoy the treat!

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If i shorten the string from the door, it works easier that if I had a longer string. I think this is because of the amount of force my puppy has on the rope at the other end.

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There was a dog treat on the first book, but my dog was too "careful" to knock over the books. (Too sneaky) 😅

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My materials I don't think he's going to be much help lol

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My materials I don't think he's going to be much help lol

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One way to complete this is to pour water into a pitcher that is hanging with a weight attached to the opposite end of string. When the water gets heavy enough, it will fall onto a contraption that will then release a large ball from its constraints to then roll down the stairs. This will then hit a series of large books set up in dominos. The last book will hit the door moving it at least 15 cm.

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Definitely would need to find an object with more force.

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Success with an innocent and unaware accomplice....

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Success with an innocent and unaware accomplice....

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Had to make some revisions to our sketch model...

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Had to make some revisions to our sketch model...

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Had to tweak it some by moving the books closer to each other, but it worked.

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I had to eliminate the water for the sake of my carpet

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I had to eliminate the water for the sake of my carpet

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I had original thought I needed a broom to act as a pulley. But it just pulled the broom over. Once I removed the broom, it worked perfectly without it. 

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I had original thought I needed a broom to act as a pulley. But it just pulled the broom over. Once I removed the broom, it worked perfectly without it. 

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tie ribbon to the oscillating fan and door knob. Use scissors to turn on the fan.

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So this really happened last week
I was hanging my hammer up,
The hammer fell and punctured a spray paint can.
The can took off and hit a kayak standing on its end.
The kayak fell and slammed the door shut and somehow hit the button to shut the garage door as well.

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Plan that I cannot execute because I have not finished building my furniture (oops)

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Plan that I cannot execute because I have not finished building my furniture (oops)

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Plan that I cannot execute because I have not finished building my furniture (oops)

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See Previous Post

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I'm not recreating mine. Wooden kayaks are expensive. Please see the design sketch.

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Define the Problem:
Need to move a door by a minimum of 15 cm
Identify Constraints and Criteria:
Constraints: Time (20 min.) and Materials (3-5 objects)
a rope
a pulley
object for weight
laser pointer
cat
Criteria:  Must use 3-5 objects, Design must be labeled to show thinking, Door must move 15 cm, Easy to reproduce.
hang the rope over the pulley with one end connected to a weight and the other wound around the doorknob.
A weight stop at the pulley
Shine the laser points at the weight stop
the cat jumps and removed the weight stop releasing the weight
the weight release will unwind the door handle opening it and nudging the door open. 

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could not create prototype due to location.  We are at an event center.

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Create a ramp from my sons changing table with wooden train tracks. To support the ramp there will be a bean bag and stuffed animals underneath. At the end of the train tracks I will line up some books, which will act as dominos, to then fall over and push on the door. Once set up, I will release a lacrosse ball at the top of the train tracks which then rolls down, runs into the books, which fall over like dominos, and hit the door

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My son is napping- I will try to create a prototype when he wakes up :)

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Use a friction motor car- attach a twine to door handle and car.  When car moves, door should open.

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Use a friction motor car- attach a twine to door handle and car.  When car moves, door should open.

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It worked!!! It took a couple tries but once the cat toy was at about 14 inches high the shower door shut 4 out of 5 times.

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I will tie a piece of yarn to the door knob and my dog's leg.I will show him a treat and he's going to walk towards me. That's going to make him open the door.

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I will tie a piece of yarn to the door knob and my dog's leg.I will show him a treat and he's going to walk towards me. That's going to make him open the door.

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1. Place books on end about 1 inch apart. Build ramp with flat end. place the basketball on the flat part of the ramp. Have the cell phone VERY close to basketball with the timer set and on vibrate. 

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1. Place books on end about 1 inch apart. Build ramp with flat end. place the basketball on the flat part of the ramp. Have the cell phone VERY close to basketball with the timer set and on vibrate. 

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Materials: bowling ball, books, and a ruler(optional).
place the ruler against the door (leaning), place books tall and lateral on the floor like dominoes, and take a bowling; when ready, roll it towards the books.

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Nina S.

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My prototype N.Sharp

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My test 😁😁