a centripetal force pulls the mass down, and the reactive centrifugal force pulls the mass up. Thus if you measure the centrifugal force you are in fact measuring the equal, but opposite, centripetal force, which you can then list on the table.
The force of gravity (mg) pulls the mass down.
When the mass does not move up or down, as indicated when the mass is above the table but does not move, the force of gravity is equal to the centripetal force.
Create a data table like the one shown.
Mass (kg) Centripetal force (N) Radius (m) Time for 20 revolutions (s) Period (s) C

Question

a centripetal force pulls the mass down, and the reactive centrifugal force pulls the mass up. Thus if you measure the centrifugal force you are in fact measuring the equal, but opposite, centripetal force, which you can then list on the table.
The force of gravity (mg) pulls the mass down.
When the mass does not move up or down, as indicated when the mass is above the table but does not move, the force of gravity is equal to the centripetal force.
Create a data table like the one shown.
Mass (kg) Centripetal force (N) Radius (m) Time for 20 revolutions (s) Period (s) C