Density and Buoyant Force

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Presentation transcript:

Density and Buoyant Force Section 1 Fluids and Buoyant Force Chapter 8 Density and Buoyant Force The concentration of matter of an object is called the mass density. Mass density is measured as the mass per unit volume of a substance.

Density is sort of a measurement of how much “stuff” (mass) is crammed into how much space (volume) A golf ball and a ping pong ball have about the same volume, but a golf ball has more mass in the same amount of space, so it’s more dense

Density and Buoyant Force, continued Section 1 Fluids and Buoyant Force Chapter 8 Density and Buoyant Force, continued The buoyant force is the upward force exerted by a liquid on an object immersed in or floating on the liquid. Buoyant forces can keep objects afloat.

Buoyant Force and Archimedes’ Principle Section 1 Fluids and Buoyant Force Chapter 8 Buoyant Force and Archimedes’ Principle Click below to watch the Visual Concept. Visual Concept

Density and Buoyant Force, continued Section 1 Fluids and Buoyant Force Chapter 8 Density and Buoyant Force, continued Archimedes’ principle describes the magnitude of a buoyant force. Archimedes’ principle: Any object completely or partially submerged in a fluid experiences an upward buoyant force equal in magnitude to the weight of the fluid displaced by the object. FB = Fg (displaced fluid) = mfg magnitude of buoyant force = weight of fluid displaced

Chapter 8 Buoyant Force Section 1 Fluids and Buoyant Force An object will Float as long As the buoyant force Equals the force of gravity

Forces on an airplane

Forces on a hot air balloon

Chapter 8 Section 2 Fluid Pressure Pressure Pressure is the magnitude of the force on a surface per unit area.

Pressure Force is measured in N and area is measured in m2 1 N/m2 = 1 pascal (Pa) When discussing air pressure, we sometimes use the unit atm (atmospheres). It describes air pressure relative to sea level.