When it comes to science, things don’t always have to be complicated. Some of the most meaningful science experiments have just a few steps and supplies, just like this science experiment on water refraction. The magic breaking pencil activity is a fun way to demonstrate how light waves work with kids and will provide tons of fun on a lazy summer day or any time of year.

Light refraction breaking pencil science experiment for kids

Recommended Grade Level:

Materials for the Magic Breaking Pencil:

  • Clear Cup
  • Water
  • Pencil
Amaze kids with the magic breaking pencil science experiment. Light refraction has never been this fun. Kids will love trying this activity over and over.

Fill a glass halfway with water and half with oil.

Tell your kids you will break the pencil, using nothing but your mind.

Amaze kids with the magic breaking pencil science experiment. Light refraction has never been this fun. Kids will love trying this activity over and over.

Lower the pencil in the water, then slowly rotate it until it looks broken from the side.

Your kids will be surprised you broke the pencil if they are young, but older kids aren’t so easily fooled.

Amaze kids with the magic breaking pencil science experiment. Light refraction has never been this fun. Kids will love trying this activity over and over.

Tell the kids you will also magically fix the pencil and slowly raise it out of the glass, revealing that it is whole once again.

After this dramatic demonstration, talk about light refraction and why a pencil will look broken when placed in oil and water.

Try the experiment with other objects and see if you can “break” them too!

THE SCIENCE LESSON

A light wave travels through a medium using a process known as refraction. Light waves can travel through objects like air, water, oil, and glass, but not through a pencil itself. Light is refracted differently through oil than water, which is why the results are more dramatic with a glass filled with half oil and half water. The light waves travel fastest through air, a little slower through water, and the slowest through oil. That is why the pencil looks so dramatically broken when you move it through the glass and look at it from different angles. You can magically “fix” the broken pencil by changing where the pencil is positioned in the glass.

Find even more engaging activities in the Life Over C’s shop!

magic broken pencil science experiment for kids pencil in a glass of water causing refraction
text saying [want more activities? Click to try these!]
author avatar
Kim Staten Owner and Curriculum Designer
Kim Staten is a mother of four children ages 20, 19, 16, and 12. Kim has taught at the preschool, kindergarten and early elementary levels for 16 years. With extensive experience working with special needs children, including her own children with special needs (Rett Syndrome, autism, anxiety, and ADHD), she creates hands-on curricula and activities that are great for working with children of all abilities in the classroom and at home. Hands-on, accessible activities are her passion. 

Similar Posts