How to make working model of the “Jaws of Life” using syringes

Creating a model of the “Jaws of Life” using syringes is a fascinating science project that can demonstrate the principles of hydraulics and mechanical advantage.

Here’s how you can make it:

Materials Needed:

  1. Large syringes (at least 4)
  2. Wooden board or sturdy base
  3. Wooden sticks or dowels
  4. Cardboard or strong plastic sheets
  5. Hot glue gun or strong adhesive
  6. Utility knife or scissors
  7. Tubing (flexible, transparent)
  8. Water
  9. Small plastic bottles or containers
  10. Optional: Small model car or object to simulate a trapped victim

Steps by Steps Video Instructions :

Working model of the “Jaws of Life” using syringes

1. Prepare the Base:

  • Start by securing your base. A wooden board works well.
  • Arrange the syringes on the base, positioning them so they can move freely.

2. Build the Arms:

  • Cut pieces of wooden sticks or dowels to make the arms of the “Jaws of Life”.
  • Attach the arms to the plungers of the syringes using hot glue or strong adhesive.
  • Make sure the arms are aligned properly and can move freely.

3. Create the Jaws:

  • Cut shapes resembling jaws from cardboard or strong plastic sheets.
  • Attach one set of jaws to one arm and the other set to another arm. These will represent the upper and lower jaws of the “Jaws of Life”.
  • Ensure the jaws can move smoothly and have space to grip objects.

4. Connect the Syringes:

  • Attach tubing to each syringe. This will allow water to flow between them.
  • Connect the tubing so that all syringes are interconnected in a series.
  • Fill one of the plastic bottles with water and connect it to one end of the tubing.

5. Test the Model:

  • Squeeze the syringe that’s connected to the water bottle. This will force water through the tubing and into the other syringes.
  • As water flows into the other syringes, the plungers will extend, causing the arms to move and the jaws to close.
  • Place an object between the jaws, such as a small model car, to simulate a trapped victim. When you squeeze the syringe, the jaws should close around the object.


  • The model works based on the principle of hydraulic pressure. When you push the plunger of one syringe, water is forced through the tubing into the other syringes, causing their plungers to extend.
  • This extension of the plungers moves the arms of the “Jaws of Life”, causing the jaws to close.

This model effectively demonstrates how hydraulics can be used to create powerful mechanical systems like the “Jaws of Life”. It’s both educational and fun for a science project exhibition.

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