DIY Marshmallow Launchers

Good morning scientists! We had a blast with our marshmallows launchers! Try it today and you will be having fun doing science with your little one in no time πŸ˜„

MaterialsMarshmallow Launchers (4)


Plastic cups

Tape (We used shipping tape)



**Never aim at anyone’s face with the marshmallow launcher**

  1. Cut the bottom off of a plastic cup.Marshmallow Launchers (6)
  2. Tape the cut edges so that no one accidentally gets a cut/scrape.
  3. Tie a knot in your balloon and cut the top off of the balloon. Stretch the cut balloon over the top (uncut, drinking side) of the cup. Tape around the edge of the balloon to reinforce the hold on the cup.
  4. Place a marshmallow inside the cup and line it up with the tied portion of the balloon. Gently hold the cup with one hand and gently pull down on the balloon knot with the other. Release the knot to launch your marshmallow. (I would highly recommend this being an outdoor activity because they can launch a good distance)Marshmallow Launchers (62)

Talking Points

Our marshmallow was able to travel due to Newton’s Laws of Motion. Newton’s 3rd law of motion states that an object at rest remains at rest unless acted upon by an outside force, for every action there is an equal and opposite reaction. The marshmallow can only launch because we pull on the balloon and release the balloon.

The law of conservation of energy states that energy can not be created nor destroyed, it can simply change forms. When we hold the balloon back this is potential energy or the energy of position. When we release the balloon the energy changes form to kinetic energy or energy of motion & sound energy you hear the release. The kinetic energy is transferred to the marshmallow causing it to launch into the air. Eventual friction (thermal energy or heat energy) from hitting air molecules and gravity the pull of object towards the largest object, in our case Earth, causes the marshmallow to fall to the ground.

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