Chapter 11

barometer

Barometrical Barometrically A tool that measures atmospheric pressure. Forecasters use a barometer to predict the weather.

buoyant force

Bouancy Nonbouyant When water of fluids exert on an upward force on an object that is submerged. The bouyant force acts in the direction opposite to the force of gravity, so it makes an object fell lighter.

hydraulic ystem

It uses liquids to transmit pressure and mulitply force in a confined fluid. Hydraulic systems use pascals principle.

density

Nondensity Superdensity The mass per unit volume. The formula for density is mass over volume.

Archimedes principle

States that the buoyant force acting on a submerged object is equal to the weight of the volume of fluid displaced by the object. Archimedes' principle applies to sinking and floating objects.

Pascals principle

States that the pressure increases by the same amount throughout an enclosed or confined fluid. When force is applied to a confined fluid it follows pascals principal and the chage in pressure is transmitted egually to all parts of the fluid.

Pascal

The SI unit of pressure is the Newton per square meter (N/m2). This unit of pressure is also called the pascal (PA): 1 N/m2=1 Pa. Named after the French mathematician Blaise Pascal. The SI unit for pascal was discovered by Blaise Pascal a French mathamatician.

Bernoullis Principle

The faster a fluid moves the less pressure the fluid exerts. Benoulli's principle helps explain how palnes fly.

fluid

fluidity fluidness A material that can easily flow. A fluid can change shape. Water oil, and gases are examples of fluids.

Pressure

An amount equal to the force exerted on a surface divided by the total area over which the force is exerted. Pressureless Interpressure The amount of pressure you exert depends on the area over which you exert a force.

Lift

An upward force. Air moves faster above the wing creating an area of low pressure which creates a lift.