QUESTION $1($STRENGTH OF MATERIAL$)$

$[22]$

$1\mathrm{.}1$ From your understanding, which type of factors affect the strength of materials?

$1\mathrm{.}2$ What are the units of strain? Give a reason for your answer.

$1\mathrm{.}3$ State the THREE types of stresses.

$1\mathrm{.}4$ Refer to the diagram below which illustrates the relationship between stress and strain. Label the points indicated as $($A$)$ to $($D$)$ and explain what happens beyond point A and $B.$

$1\mathrm{.}5$ A wire of length $5\mathrm{.}5$ m has a percentage strain of $0\mathrm{.}050\%$ when loaded with a tensile force. Determine the extension in the wire. Express your answer in mm$.(4)$

$1\mathrm{.}6$ What does the ability of an object to resist bending depend on$?$