Materials:
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- Embroidery hoop
- Bottle
- A marker or coin that has a smaller diameter than the opening of
the bottle
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| Directions: |
- Place the embroidery hoop on the opening of the bottle. Stand the
marker or lay the coin on the top of the hoop. (Hint: Align the object so it is placed
directly over the opening of the bottle.) Pull (snap!) the hoop away and the marker will
drop in the bottle.
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| Safety Concerns: |
- Beware of flying hoops if the students knock them away instead of
catching them.
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| Questions: |
- What will happen when you pull the hoop away?
- Why does the marker fall into the bottle?
- Does it always work?
- Why or why not?
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| Concepts: |
- This demo illustrates the force of gravity as well as Newton's
first second law of motion. The marker is the object at rest that tends to stay at rest.
When the hoop is removed, the marker "falls" as the force of gravity takes over.
The hoop is the object in motion that tends to stay in motion (forward moving). When this
demo does not work, 1) the hoop is pulled too slowly or in a crooked fashion so as to
"pull" the marker into a forward motion or 2) the marker or coin is too large or
not aligned with the bottle hole.
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