CIRCULAR FORCE APPARATUS are attached to a horizontal bar mounted a top a vertical shaft about 45cm high,and the vertical shaft ties the suspended mass with a horizontal spring. When the shaft is spun ,the suspended mass swings away. The displacement at any given speed is marked by a vertical mounted pointer which moves laterally to match the pointed tip of the suspended mass. By knowing the mass

CIRCULAR FORCE APPARATUS are attached to a horizontal bar mounted a top a vertical shaft about 45cm high,and the vertical shaft ties the suspended mass with a horizontal spring. When the shaft is spun ,the suspended mass swings away. The displacement at any given speed is marked by a vertical mounted pointer which moves laterally to match the pointed tip of the suspended mass. By knowing the mass