# Unit 2: Matter Chapter 3: States of Matter Section 3: Fluids

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Unit 2: Matter Chapter 3: States of Matter Section 3: Fluids

Have you turned in your Science in the News assignment?? Test on Chapter 3 WEDNESDAY Unit 2 Test FRIDAY Get out your notes and get ready

Pressure Pressure – the amount of force exerted per unit area of a surface Fluids exert pressure evenly in all directions P=force/area Measured in pascals (Pa)

Buoyant force Buoyant force – the upward force that keeps an object immersed in or floating on a fluid Results from pressure increasing with depth Object continues to sink until the forces pushing it up and greater than those pulling it down

Buoyant Force Archimedes Principle – the buoyant force on an object in a fluid is an upward force equal to the weight of the fluid that the object displaces if the weight of the water displaced is equal to the buoyant force, the object will float Sink or float also based on density

Pascal’s Principle Pascal’s Principle – a change in pressure at any point in an enclosed fluid will be transmitted equally to all parts of the fluid P1 = P2 F1/A1 = F2/A2.

Pascal’s Principle A hydraulic lift uses Pascal’s principle to lift a 19,000 N car. If the area of the small piston (A1) equals 10.5 cm2 and the area of the large piston (A2) equals 400 cm2, what force needs to be exerted on the small piston to lift the car? 1. List the given and unknown values. Given: F2 = 19,000 N A1 = 10.5 cm2 A2 = 400 cm2 Unknown: F1

F1 = 500 N

Fluids in Motion Fluids move faster through small areas than through larger areas, if the overall flow rate remains constant Viscosity – the resistance of a gas or liquid to flow Honey is more viscous than water Fluid pressure decreases as speed increases

EXIT SLIP What is buoyant force?

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