materials

Question 1

whats hooks law

Answer 1

the extension of a stretched object is proportional to the force/load

F=Ke

Question 2

how do you know the object is elastic and what happens to its atoms

Answer 2

if material returns to its original shape once force is removed

when material is put under tension, the atoms of the material are pulled apart from one another

atoms can move small distances relative to their equilibrium positions without acc changing position

once the load is removed the atoms return to their equilibrium position

Question 3

how do you know a material is plastic and how are the atoms in it

Answer 3

if the material is permanently stretched

1. some atoms in the material move position relative to one another
2. when the load is removed the atoms don’t return to their original positions
3. the object stretched past its elastic limit shows plastic deformation

Question 4

what is conserved during stretching

Answer 4

Energy

Question 5

whats tensile force and whats compressive force

Answer 5

tensile is the stretch and compressive is the squash

tensile is for +ve forces
compressive is for -ve forces