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20 Cards in this Set
- Front
- Back
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_______ have a definite volume but no definite shape
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liquids
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_______have no definite volume or shape
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gases
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What is the mixing of molecules of one fluid through another by random molecular motion?
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diffusion
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What is the attraction which causes molecules of different kinds of matter to stick together?
Be able to give an example. |
adhesion
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What is the attraction which causes molecules of the same type to stick together?
Be able to give an example. |
cohesion
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The tendency of a liquid to act as if it has a thin film on its surface
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surface tension
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a number which compares that object's density to the density of water.
Know the formula. |
specific gravity
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What is the temperature at which molecules have totally stopped moving and have no heat energy? What is this called?
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-273.15°C or -459.67°F
absolute zero |
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What is the scale of absolute temperatures?
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Kelvin (K)
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What do we call the gravitational pressure within the air that surrounds the earth?
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atmospheric pressure
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What instrument do we use to measure the height above sea level?
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altimeter
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This is the tendency for an object to float when it is placed in a fluid
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buoyancy
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T or F- Archimedes' principle of buoyancy states that the weight lost by an object immersed in a fluid is equal to the volume of the fluid displaced
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False- it is equal to the the weight of the fluid displaced
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T or F- An object will float if it is lighter than an equal volume of water; an object will sink if it is heavier than an equal volume of water
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True
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The upward force resulting in the difference in pressure on the upper and lower surfaces of a wing is called_______?
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lift
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The force that drives a plane forward through the air, allowing the wings to create lift is called_____?
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thrust
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_______is the force exerted by the air that tends to slow the movement of a plane.
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drag
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The wings of a plane or bird are designed with a shape called a(n)
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airfoil
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The force of gravity on an object is known as its_______
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weight
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This is the science of shaping objects so they allow the easy flow of fluids around them to reduce drag
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streamlining
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