He also worked on an idea that mass may exert a small shielding effect on gravitational waves, which did not gain much traction.

In accordance with Newton's third law of motion, the mass exerts an equal and opposite force on the object.

The spinning mass exerts a reaction force on the support rod.

Also, why does mass exert gravitational forces?

One mass of gas would not exert a pressure force on another.

And we'd have to live in free fall; any sizeable mass would exert unbearably high gravitational forces.

We might say that the larger mass exerts a greater "resistance" to changing its state of motion in response to the force.

The corresponding 'reaction' is the gravitational force that mass exerts on the planet.

Like an asteroid passing Jupiter, at least some part of your emotions must feel the pull that this great mass of souls exerts.

As you grapple with the slight, illusory differences, the mass of the blocks exerts a blunt, almost gravitational force.