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Essential Question: How does uncovering each hole from the 3-hole bottle affect water flow?
Vocabulary to pay attention to:
Hypothesis
Hypothesis:
A tentative explanation for an observation, phenomenon, or scientific problem that can be tested by further investigation.
Revise
Revise:
To reconsider and change or modify
Air Pressure
Air Pressure:
The pressure exerted by the atmosphere
Force
Force:
Something which changes the state of rest or motion of something.
Gravity
Gravity:
The natural force of attraction of the mass of a heavenly body (as the earth) for bodies at or near its surface
Surface Tension
Surface Tension:
Surface tension is a property of the surface of a liquid that allows it to resist an external force
So why didn't the first hole leak any water when the tape was removed?
It all has to do with gravity, air pressure, and surface tension.
Gravity pushes downward on the bottle, and the water in the bottle.
So why doesn't gravity cause the water to fall out?
Use the Destop Annotate tool in ActivInspire to
draw the effects of gravity, air pressure, and surface tension here:
Essential Question:
How does uncovering each hole from the 3-hole bottle affect water flow?
Think about the surface tension of water:
If water molecules connect to each other from all sides, then the force of those connections are stronger than the force of the pull of gravity through such a small surface area hole