# Science Chapter 4

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1. Force
a push or pull that causes movement
2. Flow Rate
how quickly a fluid flows in a given amount of time
3. Dynamic
a term described systems that involve movement, such as moving fluids
4. Aerodynamics
air or gas moving around solid objects
5. Hydrodynamics
the motion of liquids (usually water) around solid objects
6. Melting
the process of a substance changing from a solid to a liquid
7. Evaporation
the process of changing a substance from a liquid to a gas
8. Condensation
the process of changing a substance from a gas to a liquid
9. Solidification
the process of changing a substance from a liquid to a solid
10. Sublimation
• the process of changing water directly from a gas to a solid
• or from a solid to a gas
11. Kinetic
Molecular Theory
• 1. All matter is composed of molecules or other types of
• particles

2. Particles are in constant motion

3. There are forces of attraction among particles
12. Laminar Flow
flow in which a fluid travels in straight, or almost straight, lines
13. Turbulent Flow
• fluid flow characterized by irregular patterns when water is
• unable to flow in straight lines
14. Drag
• a force (air or water resistance) that acts to slow a body
• moving through a fluid
15. Streamlined
shaped to create laminar flow, has less air or water resistance (drag)
16. Viscosity
the resistance of a fluid to flowing and movement
17. Cohesion
the attractive forces among the particles of a substance
• the attractive forces between the particles of a fluid and
• the particles of another substance
19. Surface Tension
• the increased attraction among the particles at the surface
• of a liquid
20. Viscometer
an instrument that measures viscosity
21. Flow Rate Formula
• volume of fluid (mL)
• time (s)
22. Mass
the amount of matter in an object
23. Weight
measurement of the force of gravity pulling on the object
24. Volume
a measure of the amount of space occupied by matter
25. the volume of a rectangular solid FORMULA
volume = length x width x height
26. the volume of a small irregular solid FORMULA
Volume of object = (volume of water + object) – (volume of water)
27. Density

Den. Of
saltwater x 100% = .92g/cm3 x 100%

1.03 g/cm2

= 89%
Density

• Den. Of
• saltwater x 100% = .92g/cm3 x 100%

1.03 g/cm2

= 89%
28. Density – g/cm3
• Density = mass – g/mL
• Volume
29. Positive Buoyancy
Rise
30. Negative Buoyancy
Sink
31. Neutral Buoyancy
Stay
32. Buoyancy
the upward force that a fluid exerts on an object
 Author: Anonymous ID: 5027 Card Set: Science Chapter 4 Updated: 2010-01-25 01:29:54 Tags: Grade 8 Science Chapter 4 Folders: Description: Science Notes Show Answers: