# Shared Flashcard Set

## Details

chapter 11 forces in fluids
forces in fluids
37
Science
02/16/2009

Term
 What is Pressure?????
Definition
 Presure is a force exerted over an area on the surface of an object
Term
 What is PASCAL????
Definition
 The unit of pessure equalto 1 NEWTON per sq, meter
Term
 What is FLUID??
Definition
 a substance that can easily flow
Term
 What does Barometer mean?
Definition
 An instrument used to measure at mosperic  pressure.
Term
 Pressure =
Definition
 force area
Term
 what are the three princeiples?
Definition
 Archimede's; Pascals; Bernoullis
Term
 What does density mean?
Definition
 the ratio of the mass of a substance to its volume
Term
 what is lift?
Definition
 an upward force
Term
 What is the term that is an SI unit of pressure? -liter-weight-newton-pascal
Definition
 pascal
Term
 What causes the pressure exerted by a fluid?
Definition
 all of the forces exerted by the indivual particles in a fluid combine to make up the pressure exerted by the fluid.
Term
 The ________ of a substance, no matter what state of shape is its mss per unit volume.
Definition
 DENSITY
Term
 In a hydraulic system, how is the force applied on a small surface area multiplied?
Definition
 The increase inpressure, is then transmitted to another part of the confined fluid, which pushes on larger surface area.
Term
 Explain why a sheet of tissue paper rises when you blow air above the tissue paper rises when you blow air above the tissue paper.
Definition
 The curved shape of the paper gives itlift. B/c the top of the paper id curved, air moving over the top has a grerater speed than air moving under the bottom. The air moving over the top exerts less pressure than the air below. The differance in air pressure above & below the paper creates lift.
Term
 Describe how molecules move in fluids.
Definition
 The particules that makeup a fluid move constantly in all directions. When a particle collides w/ a surface it exerts a force on the surface.
Term
 What causes air pressure?
Definition
 the weight of the force that produces or atmosphere pressure.
Term
 What instrument can be used to measure atmospheric pressure?
Definition
 barometer
Term
 Density=
Definition
 MassVolume
Term
 What is bouyant force?
Definition
 The bouyant force acts in the direction opposite to the force of gravity, so it makes an object feel lighter
Term
 Decribe Archimedes' Princeiple.
Definition
 The rule that the bouyant force on an object is equal to the weight of the fluid the object displaces.
Term
 Decribe Pascal's Principle.
Definition
 The rule that when force is applied to a confined fluid, the increase in pressure is transmitted equally to all parts of the fluid.
Term
 Decribe Bernoulli's Principle.
Definition
 The rule that a stream of fastmoving fluid exerts less pressure than the surounding fluid.
Term
 Buoyancy is the ability to _________
Definition
 FLOAT
Term
 What did pascal discover?
Definition
 He discovered thaat pressure increases by the same amount throughout an enclosed or confined fluid.
Term
 How do u use Pascal's Principle?
Definition
 A hydrolic device works by applying a force to an enclosed fluid.
Term
 What is Bernoulli's Principle?
Definition
 It states that as thespeed of a moving fliud increases, the pressure decreases.
Term
 How do u use Pascal's Principle?
Definition
 A hydrolic device works by applying a force to an enclosed fluid.
Term
 How do u use Pascal's Principle?
Definition
 A hydrolic device works by applying a force to an enclosed fluid.
Term
 Dceribe Archimedes' Principle.
Definition
 Asubmerged object displaces a volume of fluid equal to its own volume.
Term
 Archimedes' principle staes...
Definition
 that the buoyant force acting on a submerged object is equal to the weight of the fluid the object displaces.
Term
 If speed increases=
Definition
 pressure decreases
Term
 If air moves faster ABOVE an object...
Definition
 fluid pressure pushes the object upward.
Term
 If the air moves faster BELOW the object...
Definition
 fluid pressure pushes it downward.
Term
 the curved shape of an airplane wing to move _______ than the air beneath the wing.
Definition
 faster
Term
 _____ moves quickly past the top of the tube causing ______ pressure
Definition
 AIR; LOW
Term
 Wind blowing across the top of a chimmney _________ the air pressure.
Definition
 LOWERS
Term
 The _______ pressure at the bottom pushes air and smoke ____ the chimney.
Definition
 HIGHER; UP
Term
 Aflying disk usses a curved upper surface to create ________.
Definition
 LIFT
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