Inertia & Gravity
Science Lab
How does it work?
The Experiment
Each group had a plastic cup, a note
card, and a coin. The placed the note card on top of the
cup, and the quarter in the center of the note card. When we quickly removed the card, what
do you think happened? The quarter fell straight down into
the cup!
Videos
of the Experiment
Be patient…the videos take a minute to load!
Click here to see Juan & Vinci successfully complete the coin “trick”.
Click here to hear Tori &
Savannah explain how the “trick” works.
How it works
We learned about gravity
and inertia.
Gravity is a force that pulls everything towards the center of the
earth. Inertia is a law of motion that
says that an object will stay at rest unless a force acts on it that is strong
enough to move it.
When doing the quarter “trick”, a force is
applied the note card. Because the note
card is smooth, no force is applied to the quarter so it stays in place. Then, gravity pulls it into the cup.
This is the same way that magicians pull
tablecloths out from dishes and glasses without breaking them!
Click here to see a
video clip of scientist Robert Krampf explain more about inertia, while doing
the tablecloth trick.
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