topic 2

1. a numerical value given to a fluid to indicate how much it resists flow
6. the stiffness constant for a material, equal to the stress divided by its corresponding strain
7. a fluid moves with uniform lines in which the velocity is constant over time
8. a force acting within a material in a direction that would extend the material
10. fluid velocity in a particular place changes over time
12. the process of alteration of form or shape
13. the Hooke’s law constant of proportionality, k
16. a force acting within .a material in a direction that would squash the material
17. the highest possible stress within this material
18. the velocity of a falling object when its weight is balanced by the sum of the drag and upthrust acting on it

2. the value that the stress will be in the material when the sample break
3. an increase in size of a material sample caused by a tension force
4. the maximum extension (or strai1n) that an object (or sample) can have, which is still proportional to the load (or stress) applied
5. a measure of the mass per unit volume of a substance
6. a strain value beyond which a material undergoes a sudden and large plastic deformation
9. a proportionate measure of the force on a sample stress=force/(cross-section area)
11. any substance that can flow
14. a proportionate measure of the extension (or compression) of a sample strain=extension/(oringinal length)
15. the maximum extension or compression that a material can undergo and still return to its original dimensions when the force is removed
17. an upwards farce on an object caused by the object displacing fluid