materials

Question 1

Tensile / compressive forces

Answer 1

Tensile - cause extension
compressive - cause a compression (gravity/weight)

Question 2

plastic deformation

Answer 2

irreversible change to a materials shape - will remain deformed after force is removed

Question 3

calculate EPE

Answer 3

1/2(Fx) - area under the graph
1/2(Kx^2) - substitution

Question 4

force extension graphs

Answer 4

(loading/unloading forces) same gradient (parallel) - end at different places - shows plastic deformation
area underneath = energy stored/lost

Question 5

rubber bands

Answer 5

hysteresis loop (bounded area = thermal E)
polymeric material - consists of long chains
hard to stretch at beginning/end
(strong IMF/stretched as far as possible)