Does Gravity Bow serve to bypass DR/Magic?

Question

Can the gravity bow spell serve as a way to bypass magic reduction? Does using the spell make the damage count as magic?

Answer 1

No, it does not

While increased damage can certaibly help with penetrating through damage reduction, for a weapon to count as magical, an enhancement bonus must be added to it: either permanently, via enchanting it with the Craft Magic Arms&Armor feat, or temporarily, for example, with the Magic Weapon spell:

More information can be found here:

Damage Reduction may be overcome by special materials, magic weapons (any weapon with a +1 or higher enhancement bonus, not counting the enhancement from masterwork quality)

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For example, DR 5/magic means that a creature takes 5 less points of damage from all weapons that are not magic

A resulting weapon, if it were, for example, a Longsword, would be called "+1 Longsword", where +1 is your new weapon's enhancement bonus. Note that this bonus is listed before the weapon's name: when reading bestiary entries, you will see that the numbers listed after the weapon are total calculated attack bonuses. For example, Bralani Azata can attack with her +1 composite longbow two times, her attack bonuses being +13 and +7. Common Orcs, though, don't possess +5 falchions, even though it's not hard to mistake this total calculated attack bonus for a magic weapon's enhancement bonus if you are not used to the format.