Chapter 7 - Holt Forces in Fluids

Section 1 pages A fluid is any material that can _____ and that takes the shape of its container. Fluids include liquids, such as _________ and _________, gases such as ____________ and _________ ___________.

Fluids are able to flow because the particles in fluids, unlike the particles in solids can move easily _________ each other.

The following equation can be used to find the pressure, or rearranged to find force or area. Pressure = Force / Area The SI unit for pressure is the _______

Why are bubbles round?

Why do your ears ‘pop’ when you are in a plane taking off or in a car travelling down a steep mountain road?

The pressure caused by the weight of Earth’s atmosphere is called ___________ ___________. Fluids exert pressure __________ in all directions

Fluid pressure ___________ as depth increases. Fluids flow from areas of _________ pressure to areas of _________ pressure.

Pascall’s Principle states that a change in pressure at any point in an enclosed fluid will be __________ __________ to all parts of the fluid. __________ devices transmit changes of pressure through liquids.

Section 2 pages Any object that is more dense that the surrounding fluid will ________. Any object that is less dense than the surrounding fluid will ________.

All fluids exert an upward force called __________ force, which is caused by differences in _________ pressure.

______________ Principle states that the buoyant force on an object is equal to the weight of the fluid _________ by the object.

Section 3 pages Bernoulli’s Principle states that fluid pressure decreases as the speed of a moving fluid _________.

Concerning flight. Wings are often shaped to allow airplanes (and birds) to take advantage of decreased pressure in moving air in order to achieve ____________.

________ is an upward force that acts against ________. _______ opposes motion through fluids

Lift on an airplane is determined by _________ size and ________. Thrust is the forward motion produced by the __________ of an airplane.

questions 1. Compared with an empty ship, will a ship loaded with plastic-foam balls float higher or lower or the same level in water? Explain your answer.

2. If an object weighing 50 N displaces a volume of water with a weight of 10 N, what is the buoyant force on the object? Show your equation and work.

3. A helium-filled balloon will float in air because _______________________

4. Where is warer pressure greater? At a depth of 1 m in an ocean, or, at a depth of 2 m in a small pond? Explain your answer.

Inside all vacuum cleaners is a high- speed fan. Explain how this fan causes dirt to be picked up by the vacuum cleaner.

Look at Interpreting Graphics page 181. Answer questions 21,22,23,24 concerning icebergs.

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