# AS Physics 2.2 Keywords

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1. Hook's Law
Force exerted on a string is directly proportional to its extension
2. Elastic limit
The point beyond which the wire is permanently stretched and suffers plastic deformation
3. Elastic strain energy
The work done to deform an object
4. Necking
As stress increases, the sample begin to narrow at one point
5. Yield point
the point where the material shows a large increase in strain for small increase in stress
6. Stifness
the ability of a material to resit tensile force
7. Tensile strength
the tensile stress at which a material fails
8. Compressive stress
compressive force per unit area
9. compressive strength
compressive stress which a material breaks
10. Compressive strain
Extension per unit length
11. Ductile
• A material which can undergo large amount of plastic deformation
• able to undergo permanent deformation under tensile stress
• can be drawn into wires
12. Limit of proportionality
• stress proportional to strain
• obeys Hooke’s law
•  Force proportional to extension up to this point
13. Brittle
Materials which break with little or no plastic deformation
14. Malleable
• Material which can undergo a large plastics deformation before cracking or breaking.
• Can be beaten into sheets
15. Elastic deformation
• returns to original shape when deforming force/stress
• removed /no permanent deformation
16. Plastic deformation
• force/stress removed / permanent deformation
17. criteria for Stoke's Law
• (Stokes’ law is only for) small smooth (solid) spheres
• (Stokes’ law is only for) laminar flow
• there is turbulent flow
• Additional/less drag due to the bubbles having a non-stationary surface
• Stokes’ law cannot be applied to a gas bubble because they have a nonstationary
• surface
• sides of container too close to bubbles
• volume/shape changes as it rises
• Stokes law can only apply at slow speeds
18. Tough
• Materials able to withstand large impacts forces without breaking and require a large force to produce small plastic deformation
• Able to absorb large amount of energy without failure
• Able to absorb a lot of energy in the plastic region
19. Hard?
Materials which resist plastic deformation by denting, sratching or cutting.
 Author: kc97 ID: 298416 Card Set: AS Physics 2.2 Keywords Updated: 2016-05-23 16:38:03 Tags: Materials Folders: AS Physics Unit 1 Description: AS physics Show Answers: