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.

1. False
   
2. This may happen in many cases, but not
   

in every case