I'm sure many here have had their Wizard cast Animate Objects on 10 Silver coins that they've carried specifically for this use.  As we know, many foes have Resistance to non-magical attacks which usually would mean Resistance to our Animated coins.  Could we cast the Magic Weapon spell on our 10 coins to overcome this?

Cheers in advance.

Short answer, no.

Long answer:

Animate objects says the following:

Each target animates and becomes a creature under your control until the spell ends or until reduced to 0 hit points.

Magic weapon says the following:

You touch a nonmagical weapon.

Weapons are objects, not creatures. Anything you animate with the animate object spell categorically disqualifies it from being targetable by magic weapon.

And even if that weren't the case, coins aren't weapons either.

On top of that, even if the coins could be targeted by the spell, the spell would only affect a single coin.

Even if the coins counted as weapons you cannot make all 10 of them magical as the spell only affects a single weapon, not to mention you will need another caster to do it because both Animate Objects and Magic Weapon requires concentration.

So you would need 11 casters to pull off this combo provided your DM is lenient enough to let the coins be counted as weapons.

Cheers all.