Fluids

A state of matter in which a substance has neither a definite shape or volume

• liquid

• gas

• solid

• viscosity

How does air pressure change as you go from the top of a mountain to sea level?

• pressure increases

• pressure decreases

• pressure stays the same

• it depends of the weather

The term fluids generally applies to:

• solids and liquids

• liquids and gases

• solids and plasma

• solids and gases

The upward force exerted by a fluid is called the:

• buoyant force

• density force

• fluid force

• normal force

Why do fluids expand when they are heated?

• The particles get bigger

• The particles vibrate more and take up more space

• The particles vibrate more and get closer together

• The particles stick together

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Which of the following is an example of when you can feel a fluid (like air) moving?

• wind blowing

• a room feeling warm

• sitting at a desk studying

• sleeping in a bed

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Which fluid particles move the most or the fastest?

• Hot gas particles

• Warm liquid particles

• Cool gas particles

• Cold liquid particles

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Fluids flow (check all that apply):

• when warmed up.

• until they become solid.

• until evenly spread out.

• from high toward low pressure.

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What happens when air is warmed?

• It sinks down

• It remains where it is

• It starts rising

• it moves in all directions equally

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The air resistance of a object can be reduced by:

• making the object larger.

• giving the object a streamlined shape.

• making the object heavier.

• putting making sure the object is completely sealed up.