When suzanna stands on the floor on the
surface of the earth, of the two external forces
acting on her, her perception or sensation of
weight directly depends on the upward force
the floor exerts on her, not the downward
force of gravity.
1. true
2. none of these
3. this may happen in a few cases, but it is
very rare.
4. false
5. this may happen in many cases, but not
in every case