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17 Cards in this Set
- Front
- Back
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A ______ has molecules that are packed tightly together and only vibrate.
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solid
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A____ has a definite volume but no definite shape; molecules move.
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liquid
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A ____has no definite volume or shape; molecules move rapidly.
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gas
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The tendency of a liquid to act as if it had a thin film on its surface is known as __ ___.
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surface tension
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The force exerted per unit of measure is known as ____.
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pressure
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What is the formula of pressure?
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Pressure = force/area
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The fluid's weight causes it to exert more pressure at greater depths - this pressure caused by the fluid's weight is __ ___.
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gravitational pressure
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The air pressure caused by the weight of the atmosphere is called ____ ____.
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atmospheric pressure
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The _____ is an instrument used to measure the atmospheric measure.
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barometer
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____ are scientists who study the weather.
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meterologists
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An ____ is an instrument that measures height (altitude) above sea level.
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altimeter
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Fluids see to move from areas of ________pressure to areas of ________ pressure.
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From higher pressure to lower pressure
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Archimedes reasoned by ___ would be displaced by the volume of an object. The___ force of the water is equal to the fluid displaced.
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water
bouyancy force |
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Why did steel ships float?
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Because they are hollow and the air in the hollow areas causes the ship to be lighter than the volume of air.
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How do submarines use bouyancy to sink?
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They allow water into the hollow tanks in the submarine so that the submarine is heavier than the surrounding ocean water.
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Why do golf balls have dimples?
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The dimples in the ball cause the air flow to be disturbed and have less drag, allowing the ball to go further.
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Why do baseballs have seams and they curve?
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The seams cause the air around the ball to be disturbed and the air flow will cause the ball to spin.
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