"hard objects" is a correct and usable phrase in written English.
For example, "The force of the collision damaged both vehicles, as well as the hard objects in the vicinity."
The warehouse was chilly and dark, and full of large, hard objects related to the making of furniture.
League policy prohibits only "metal or other hard objects that project from a player's uniform, including from his shoes".
Most modern branchiopods anchor by the pedicle to pebbles, to the undersides of stones, or to other hard objects.
She was warned that the object was "unfit for defence against hard objects such as bullets, nails, knives and swords".
(They also decided to defuse the violence by showing, during the end credits, the plasticity of apparently hard objects used as weapons in the movie).
The problem was that, in the whirlwind of Trump's rage, there were some hard objects swirling around and banging into Cruz's story.
Ranges from exceedingly stout and blunt (such as the hawfinch, Coccothraustes, which can crack remarkably hard objects, such as cherry pits) to relatively small and pointed (siskins, Carduelis).
Musicians pour bags of hard objects onto the stage, and recite fragments of protest speeches, sometimes through a megaphone, sometimes whispered with exaggerated articulation.
Because parents can be apprehensive about the combination of air, snow and hard objects, ski schools make an extra effort to alleviate anxiety about terrain park lessons.
Since I truly dislike falling from a bicycle onto hard objects, I was surprised at my willingness to risk injury and scare myself witless at the same time.
Hard objects repel each other quickly; equally heavy but softer objects have "give" that allows their contact to last longer and accept the force less jarringly.
