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8th Grade Chapter 11
Forces in Fluids
| Question | Answer |
|---|---|
| pressure is | force divided by area |
| water pressure increases as | depth increases |
| air pressure exerted equally on an object from different directions is | balanced pressure |
| if an object floats, the volume of displaced water is equal to | the volume of the portion of the object that is submerged |
| the SI units of pressure | pascal, Pa, N/m2 |
| Bernoulli's principle states | that the pressure exerted by a moving stream of fluid is less that the pressure of the surrounding fluid |
| a material that can easily flow is called a | fluid |
| Pascal's principle states that when force is applied to a confined fluid, the change in pressure is transmitted | equally to all parts of the fluid |
| an object under water feels lighter than it does in air because of | buoyancy |
| hydraulic systems | multiply force |
| a substance whose shape can easily change is | a fluid |
| mass per unit volume of a substance is its | density |
| fluid exerts pressure because they are made up of tiny | moving molecules that exert forces |
| an object that is more dense than the fluid in which it is immersed will | sink |
| a ship stays afloat as long as the buoyant force is | equal to the ship's weight |
| a hydraulic system | multiplies a force by transmitting it to a large surface area |
| Archimedes' principle states that | the buoyant force on an object is equal to the weight of the fluid displaced by the object |
| one application of Pascal's principal is | a hydraulic car lift |
| Bernoulli's principle helps to explain | flight |
| air pressure decreases as | elevation increases |
| Pascal's principle deals with | fluids |
| buoyant force | acts in an upward direction |
| the braking system on a car is an example of | a hydraulic system |
| when water fills a submarine's flotation tanks, | the overall density of the submarine increases |
| bubbles rise in water because | they are less dense than water |
| air above an airplane wing is moving faster than the air below an airplane wing | this causes the plane to increase its elevation |
| if you blow a stream of air between two balloons that are next to each other | the balloons move toward each other |
| given that the air pressure outside your bode, you aren't crushed because | the pressure inside your body balances the air pressure outside your body |
| smoke rises up a chimney partly because of | Bernoulli's principle |
| snowshoes enable a person to walk on deep snow because | the snowshoes increase the area over which the person's weight is distributed |
Created by:
Mrs. Gordon
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