Pressure
3. At higher elevations, air pressure is ______ because there is less air above.
less
9. An object under water feels lighter than it does in air because of
buoyancy
15. When pressure is applied to a confined fluid, the increase in pressure is transmitted equally to all parts of the fluid. The fact is called______.
Pascal's principle
18. If you blow a stream of air between two balloons that are next to each other, the balloons will move ___________ each other.
towards
1. ________, _________, __________ all mean the same thing and are the SI unit of pressure.
N/m2 , Pa, Pascal
4. Fluids exert pressure because they are made up of tiny ____________ that exert forces.
moving molecules
11. Bubbles rise in water because they are ______ dense than water.
less
16.A device that increases force that works because of Pascal's principle, such as the braking system of a car, is called a
hydraulic device
19. Air above an airplane wing is moving faster than air below an airplane wing. This causes the plane to ___________ in elevation.
increase
7. The density of an object would be changed by changing the object's volume or its _______.
mass
5. The pressure exerted by the gas in Earth's atmosphere is called air pressure or
atmospheric pressure
12. The density of a substance is its _______ per unit volume.
mass
17. The outward pressure exerted by a fluid decreases as the speed of the fluid _________
increases
20. The flow of smoke up a chimney is explained by _________________.
Bernoulli's principle
10. An object is dropped into a beaker containing a liquid. The object drops to the bottom of the beaker. Therefore, the density of the object is _______ than the density of the liquid.
greater
8. Water pressure _________ as depth increases.
increases
13. Archimedes principle states that the buoyant force on an object is equal to the _______ of the fluid displaced by the object.
weight
2. Pressure is equal to ________ divided by _______.
force divided by area
14.The buoyant force always acts in an __________ direction.
upward