Materials Flashcards
(25 cards)
How do you calculate density of a regular solid
Measure mass using a balance
Use a metre ruler to measure volume
Do density calculation
How to measure density of liquid
Measure mass of a container using a balance then mass of container and liquid
Difference of mass is mass of liquid
Read volume of breaker or measuring cylinder with and without object submerged in water
Difference in volume is volume of liquid
Do density calculation
How to measure density of an irregular solid
Measure mass using a balance
Read volume of beaker or measuring cylinder without object submerged in water
Difference in volumes is the volume of the solid
Do density calculation
State Hooke’s Law
The extension produced by a force in a wire is directly proportional to the force applied, up to the limit of proportionality
How do you work out spring constant of two springs connected in parallel, then series
What does the area under a force extension graph represent
Work done in strecthing the material
(Only can calculate the area up to limit of proportionality)
What is a ductile material
A ductile material can be easily strecthed, drawn out into wires
What is a brittle material
Brittle material cannot be permanently stretched
It will break soon after the elastic limit
What is the fracture point
The point at which material breaks due to the force applied
What is elastic and plastic behavior
Describe properties of graph A,B and C
All graphs up to their fracture point
Describe characteristics of rubber
What does the area beneath the loading curve and unloading curve represent
What feature of a rubber chord confirms it is elastic
Returns to its original length and has no permanent extension
Which material should be used for a cable supporting a lift and for a bungee rope
Cable supporting lift
Not A because it fails without warming
Not C or D as it has a lower breaking stress
Bungee rope
Not A,B,C because high young modulus so sudden stop
Not C because if behaves plastically it will not return to original length
B
