Fluid Forces Mrs. Clarici

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Presentation transcript:

Fluid Forces Mrs. Clarici Pressure: Fluid = a substance that flows Force = a push or a pull Unit for force = newton or N Area = length X width Metric unit for area = m2 Pressure = force exerted over an area on the surface of an object FORCE Unit for pressure = pascal or Pa or N/m2 Pressure = force As AREA , PRESSURE . area There is an inverse relationship between pressure and area.

Fluid Pressure Mrs. Clarici fluid = a substance that flows (gas or liquid) exert = to use (influence, authority, etc) forcefully or effectively All forces exerted by the individual particles in a fluid combine to make up the pressure exerted by the fluid. Atmospheric pressure = air pressure Barometer = measures atmospheric pressure As ELEVATION , PRESSURE . (less air on top of you) (altitude) As ELEVATION , PRESSURE . (more air on top of you) Why do your ears “pop” when you change elevation on a plane or mountain?

Fluid Pressure Mrs. Clarici water depth = how far below you are under water As depth , water pressure . (more water -and air- on top of you) More pressure on the balloon makes it smaller. Which gas law does this demonstrate? Explain. Why does the water come out differently from each hole?

Archimedes’ Principle Mrs. Clarici The buoyant force acting on a submerged object is equal to amount of fluid the object displaces. buoyant force = upward force acting on a submerged object. Buoyant force acts in the opposite direction of gravity, making the object feel lighter. (unit=N) If the weight of the rock was 50 N, what would be the weight of the water displaced? Explain.

Density Mrs. Clarici density = mass unit for density = g/mL or g/m3 volume

Pascal’s Principle Mrs. Clarici When force is applied to a confined fluid, the change in pressure is transmitted equally to all parts of the fluid. confined fluid = fluid in a container with no openings. Hydraulic system multiplies force by applying the force to a small area. The increase in pressure is transmitted to another part of the confined fluid, which pushes on a larger surface area.

Bernoulli’s Principle Mrs. Clarici As the speed of a moving fluid increases, the pressure within the fluid decreases. As speed , pressure . Fluids naturally flow from high pressure to low pressure. weight = force of gravity Explain why you should not have loose clothing Why would the cans move inward near the front top of the fan. in the diagram above?