It's pretty straightforward to toggle on units support at the interative top-level. Note that the SI system is the default. In SI, the Newton (N) is the base unit for representing force. So output with that dimension comes out in terms on Unit(N).

In 1D Maple input, you can just type it in directly, as in the example below.

> with(Units[Standard]):
> 35*Unit(kN) + 7*Unit(MN);
                                  7035000 [N]

If you instead want kN to be the default base for output, so that the above comes back as 7035 [[kN]], then that too can be done with a customized system. To see an example of that, enter this Maple command to see a help-system page,

?Task,ChangeDefaultUnitInSystem

Alternatively, you can convert output like 7035000 [[N]] to 7035 [[kN]] using the context-menus. Select the output with the mouse, and when the context-menu pops up choose "Units" -> "Replace Units".

In 2D Math output, the Unit(N) object should get typeset as something that looks like [[N]]. To get that in 2D Math input, you can use the "Units (SI)" palette. Or use command-completion.

See the top menubar's "View" -> "Palettes" -> "Arrange Palettes" for a popup menu to configure which palettes show up in the left sidebar.

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