Shown below is a simply supported light beam, ABCD.

$(2$

$4\mathrm{.}2\mathrm{.}1$ Calculate the reaction forces at the support A and $D,$ and test the answer.

$4\mathrm{.}2\mathrm{.}2$ Calculate the bending moments at points $A,B,C$ and $D.$

$(4)$

$4\mathrm{.}2\mathrm{.}3$ Draw a bending$-$moments diagram.

$(4)$

$4\mathrm{.}2\mathrm{.}4$ Draw a shear$-$force diagram.

$(2)$

$(3)$

$[15]$

ESTION $5$Okay