Assertion: body's force | /r/HasProperty | due
Facets:
Source sentences:
text: In general, as long as all forces are due to the interaction of objects with mass, it is possible to define a system such that net momentum is never lost nor gained.
text: The weak force is due to the exchange of the heavy W and Z bosons.
text: The normal force is due to repulsive forces of interaction between atoms at close contact.