7
Cut out a boat from a milk carton shaped like this one. Put a tiny chip of soap on the back of the boat. Gently put your boat in water and watch it go-go-go! Surface tension! Surface tension pulls on things that float in water. Soap breaks surface tension at the back of the boat. Surface tension pulls the front more than the back and the boat moves forward. How can soap power a boat?
1. 2. 3.
Carefully set a needle in a cup of water until it floats. Ask another person to do it after you. If you know the trick, his or her needle will not float. Scrape some soap under the nail of your middle finger. Use your index finger and thumb to float your needle. Use your thumb and middle finger to remove the floating needle. The soap under your nail will mix with the water. This breaks the surface tension and the next needle will sink. You alone will be able to oat the needle on water! The TOP SECRET Trick:
1. 2.
1. 2. 3.
Standards Link: Investigation and Experimentation: Follow a set of written instructions for a scientific investigation.
DUCKY SURFACE TENSION CLEAN SOAP WATER MOLECULES
Can you find the ducky that is different?
Find the words by looking up, down, backwards, forwards, sideways, and diagonally.
M O
T A P E P A C T E
Y A W A T E R S M
E N O I S N E T R
R S E B E A C A V
E P P Y S E A O A
C K O I K L F L I
B U S R L C R F K
R E N R D L U D N
I R E U B B S D I
L E C U L E S
LENS BOAT SPILLS FLOATS
SINK BRIM TAPE DROP
Standards Link: Letter sequencing. Recognize identical words. Skim and scan reading. Recall spelling patterns.
Standards Link: Visual discrimination; differentiating between similar objects.
© Vicki Whiting June 2025
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