The function formpart is most effective on products.  It will try to simplify other expressions to products.

This function removes scalars and constants from a product, leaving only that part which is a form, or is undeclared.

This function and scalarpart can be used to separate a product into form and scalar parts.

The command with(difforms,formpart) allows the use of the abbreviated form of this command.

$\mathrm{with}\left(\mathrm{difforms}\right)\:$$\mathrm{defform}\left(f=\mathrm{scalar}\right)$

$\mathrm{formpart}\left(2\left(fv\right)\&ˆu\right)$

$v\&ˆu$