Unit 3: Motion, Forces, & Energy Chapter 11: Motion & Energy Big Idea: If an object is less dense than a fluid, it will float in the fluid. If an object is more dense than a fluid, it will sink in the fluid

Mrs. Lee - Ch Sections 1.Pressure 2.Floating & Sinking 3.Pascal’s Principle 4.Bernoulli’s Principle

Mrs. Lee - Ch 113 Sec 1: Pressure KEY CONCEPTS The amount of pressure you exert depends on the area over which you exert a force Pressure =Force Area In a fluid, all of the forces exerted by the individual particles combine to make up the pressure exerted by the fluid

Mrs. Lee - Ch 114 Sec 1: Pressure (cont’d) Atmospheric pressure decreases as your elevation increases Water pressure increases as depth increases

Mrs. Lee - Ch 115 Sec 1: Key Terms Pressure Pascal Fluid Barometer

Mrs. Lee - Ch 116 Sec 2: Floating & Sinking KEY CONCEPTS Density = Mass Volume By comparing densities, you can predict whether an object will float or sink in a fluid The buoyant force acts in the direction opposite to the force of gravity, so it makes an object feel lighter

Mrs. Lee - Ch 117 Sec 2: Key Terms Density Buoyant force Archimedes’ principle

Mrs. Lee - Ch 118 Sec 3: Pascal’s Principle KEY CONCEPTS When force is applied to a confined fluid, the change in pressure is transmitted equally to all parts of the fluid A hydraulic system multiplies force by applying the force to a small surface area. The increase in pressure is then transmitted to another part of the confined fluid, which pushes on a larger surface area

Mrs. Lee - Ch 119 Sec 3: Key Terms Pascal’s principle Hydraulic system

Mrs. Lee - Ch 1110 Sec 4: Bernoulli’s Principle KEY CONCEPTS Bernoulli’s principle states that as the speed of a moving fluid increases, the pressure exerted by the fluid decreases Bernoulli’s principle helps explain how planes fly. It also helps explain how an atomizer works, why smoke rises up a chimney, & how a flying disk glides through the air

Mrs. Lee - Ch 1111 Sec 4: Key Terms Bernoulli’s principle Lift