Ch & 11.4 Guided Reading Check

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Presentation transcript:

Ch. 11.3 & 11.4 Guided Reading Check

1. What is the unit for pressure? 2. Where did this name come from? (Pa) Pascal= 1N/m2 2. Where did this name come from? Blaise Pascal 3. Where was he from? France 4. How do fluids exert pressure? Equally to all parts of the fluid. 5. What is Pascal’s Principal? When force is applied to a confined fluid, the change in pressure is transmitted equally to all parts of the fluid.

6. What is a hydraulic system? A hydraulic system uses liquids to transmit pressure in a confined fluid. 7. How does a hydraulic system work? 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. 8. What are hydraulic lifts? Hydraulic lift systems are used to raise cars off the ground so mechanics can repair them with ease.

9. How do hydraulic brakes work? When a driver pushes down on the brake pedal, he or she pushes a small piston. The piston exerts pressure on the brake fluid. The increased pressure is transmitted through the fluid in the brake lines to larger pistons within the wheels of the car. Each of these pistons pushes on a brake pad. The brake pads rub against the brake disc, and the wheel’s motion is slowed down by the force of friction. Because the brake system multiplies force, a person can stop a large car with only a light push on the brake pedal.

11. 4 11. Who were the Wright brothers? The flew a plane that was heavier (denser) than air 12. How does a fluid naturally flow? Fluids flow from an area of high concentration to an area of low concentration. 13. How does a straw work? When you start to sip, you remove the air from the straw. This creates an area of low pressure in the straw. The higher pressure pushing down on the surface of your drink forces the drink up into the straw.

16. What is Bernoulli’s principle? 14. Who was Bernoulli? Daniel Bernoulli discovered that the pressure of a moving fluid is different than the pressure of a fluid at rest. 15. Where was he from? Sweden 16. What is Bernoulli’s principle? States that as the speed of a moving fluid increases, the pressure within the fluid decreases. 17. How did the Wright brothers use this principle to fly? An airplane wing is designed to produce an upward force for a plane in flight. Air moves faster above the wing, creating an area of lower pressure.

19. How does the curved shape of the wing help provide lift? 18. What is lift? An upward force. 19. How does the curved shape of the wing help provide lift? The top of the wing is curved, air moving over the top has a greater speed than air moving under the bottom. As a result, the air moving over the top exerts less pressure than the air below. The difference in air pressure above and below the wing creates lift. 20. How does an atomizer work? The difference in pressure between the top and bottom of the tube draws the perfume upward.

21. How do chimney’s work? 22. How do Frisbees work? 1) Hot air rises 2) Wind blowing across the top of a chimney creates an area of low pressure. The difference in air pressure between the top and bottom of the chimney helps keep air moving upward. 22. How do Frisbees work? Like an airplane wing, a flying disk uses a curved upper surface to create lift.