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# Forces in Fluids Notes

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### Forces in Fluids Notes

1. 1. FORCES IN FLUIDS
2. 2. BIG IDEAS <ul><li>Newton’s laws apply to all forces </li></ul><ul><li>Gravity is a force exerted by all masses </li></ul><ul><li>Friction is a force that opposes motion </li></ul><ul><li>Pressure depends on force and area </li></ul><ul><li>Fluids exert a force on objects </li></ul>
3. 3. Terms Defined <ul><li>Gravity - the force that objects exert on each other because of their masses </li></ul><ul><li>The more mass an object has the stronger the gravity </li></ul><ul><li>Weight - is the force of gravity on an object </li></ul><ul><li>Mass - measure of how much matter something contains </li></ul>Gravity is responsible for controlling planetary orbit
4. 4. Terms Defined <ul><li>Fluid - any substance that can flow easily </li></ul><ul><li>Gases and liquids are fluids </li></ul><ul><li>Friction due to air is called air resistance </li></ul><ul><li>It can also be called drag </li></ul>Air resistance Gravity
5. 5. Terms Defined <ul><li>Pressure - how much force is acting on a certain area </li></ul><ul><li>Tells how concentrated a force is </li></ul><ul><li>The SI unit for pressure is pascal ( Pa ) </li></ul><ul><li>Pressure = force/area </li></ul><ul><li>P = F / A </li></ul>
6. 6. Questions <ul><li>How does changing elevation affect air pressure? How does changing depth affect water pressure? </li></ul><ul><li>A board with an area of 3 m 2 has a 12 N force exerted on it, what is the pressure on the board? </li></ul>
7. 7. Fluid Terms Defined <ul><li>Buoyant Force - the upward force on objects in a fluid </li></ul>Density : amount of matter packed into a given volume. Helps determine whether an object floats or not Weight Buoyant Force Weight Buoyant Force
8. 8. Bernoulli’s Principle <ul><li>An increase in speed of the motion of a fluid decreases the pressure within the fluid. The faster a fluid moves, the less pressure it exerts on surfaces </li></ul>Airfoil Lift Thrust Drag Weight
9. 9. Pascal’s Principle <ul><li>When an outside pressure is applied at any point to a fluid in a container, that pressure is transmitted throughout the fluid with equal strength </li></ul>I’m a pretty smart guy!!