Popsicle Catapult

The catapult is a machine that throws projectiles (items). With this one machine, we can learn about physics, engineering, projectile motion, and kinetic energy.

Let’s start with physics. Physics is a form of math that deals with the motion of everyday objects, like a ball being shot form a catapult. The main laws of physics are Newton’s three laws of motion, but for now we will focus on Newton’s first and third law.

  • Newton’s first law, or the law of inertia, “An object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force.”
  • Newton’s third law, “For every action, there is an equal and opposite reaction.”

Continuing off with engineering, it is the design or creation of a new invention, or even developing a new method to make that invention. With engineering, we can create new designs for the catapult for better or for worse.

Projectile motion is the movement of the item that the catapult is launching. With projectile motion and also physics, it is possible to determine where to aim, where the item will land, and how to adjust your aim.

Finally, a catapult teaches kinetic energy. kinetic energy is energy, or even electricity, created by motion (movement).

Now here are some instructions to build a very basic catapult, which you can learn from, and eventually even use engineering to create a new and better design for your catapult.

Supplies neededIMG_1753

  • 9 Popsicle Sticks
  • 1 Bottle Cap
  • 3 Small Rubber Bands
  • 1 Medium or Big Rubber Band
  • Adult Assistance with Hot Glue (Works best, but you can use any other strong glue, or even Elmer’s Glue)

Step 1


  • Take seven Popsicle sticks and stack them upon each other.
  • Then take a small rubber band and wrap it around one edge of the stack, and the same thing for the other side with another small rubber band.

Step 2

  • Take the last two Popsicle sticks, stack them upon each other, use the last small rubber band and wrap it onto one of the edges.


Step 3


  • Take the two stack Popsicle stick, spread apart the edge that isn’t held by a rubber band, and slide the seven stack Popsicle stick in between.



Step 4


  • Take the medium or big rubber band and wrap it around the center of your catapult (Adult assistance may be needed)



Step 5



  • On this step, adult assistance is greatly advised, glue your bottle cap to the top Popsicle stick with the opening up.



Step 6



  • Have fun with friends and family and make multiple catapults.




Play some games when you have a chance.



Joseph’s Robotic Hand


Hello again, this is Joseph, the 10 year old teacher at Tech 101 Kids.  I am going to show you how to make an easy homemade robotic hand using straws and strings.

What You’ll Need

robot-hand-2These are the supplies needed to make the straw hand

  • five straws
  • string
  • sharpie
  • scotch tape




robot-hand-31) Tape four straws together with scotch tape.




robot-hand-42) The fifth straw is taped on the opposite side of where the thumb is.







robot-hand-53) With the Sharpie mark each of lines in your hand.







robot-hand-64) Cut a diamond on the lines by bending it forward.








5) Do it for all of fingers.








robot-hand-86) When its all done,  take one string  and pass it from one end to the other of the straw.  Do it in each straw.








7) Make a small cut on the top of the straw. Make a knot on the string,  secure it in the cut with a piece of tape.







robot-hand-108) Do it with all and you get this.





robot-hand-119) Then if you pull the strings, the hand will close its fingers..







robot-hand-1210) You can even lift it paper balls with your new robotic hand  and it won’t fall (possibly).








Well, I hope you enjoyed doing this robotic hand to impress your friends.  Visit more of my posts to learn more cool projects to do.

Bristle Bot – Bumper Car Brush Robot


Hi my name is Joseph Pinos, I am ten years old and I am a teacher at Tech 101 Kids and today I am talking about how I made my Bristle bots.

What You’ll Need


Recycled supplies:

  • A scrubbing brush
  • a motor taken from a play station remote or anything that vibrates, like cell phones (you could also buy vibration motors instead like these.

Supplies we got from Amazon:



  1. I got a play station remote, took the screws out with a small screw driver and took the motor from the right (the one that looks like it’s in half)
  2. I twisted the metal ends of cables of the motor together with the cables from the battery snap, red cable is positive and black cable is negative. Then I covered the twisted wires with electrical tape (I attached a small on/off switch in between the positive cable and the battery to control the robot)
  3. Using hot glue, I glued the battery on one side of the brush and the motor at the other end
  4.  Ready for some fun!!!