Example $8\mathrm{.}3$ A small block of weight $1000$ N as shown in Figure $8\mathrm{.}10,$ is placed on a $30$

inclined plane with $=0\mathrm{.}25.$ Determine the horizontal force to be applied for:

$($i$)$ Impending motion down the plane

$($ii$)$ Impending motion up the plane.