1.0 LEARNING OUTCOMES : 1.1 This experiment permits an investigation of the physic laws of such circular motion,
for example the relationship between the radius o f the arm, mass and speed of the body.
2.0 EQUIPMENT / APPARATUS : 2.1 2.2
Centrifugal Force Apparatus TM600 Body (54g, 79g, 105g)
3.0 SAFETY AND HEALTH : 3.1 SAFETY SHOES
4.0 THEORY :
The following experiments are designed to substantiate the relationship F = mrω2 . Where, m = mass r = radius ω = angular velocity
5.0 PROCEDURES : Experiments 1: Centrifugal Force as a Function of Speed.
1 ) Select body m=105 g and arm radius , r =100mm 2)
Increase speed from 100 to 450 rpm increments of 50 rpm.
3)
The expected centrifugal force can be calculated from the speed in rpm as shown below: F = mr ω2= mrπ2n2 = 0.000115N2
4)
Measured and calculated results are compared in table 1.
Experiment 2 : Centrifugal Force as a Function of Mass
1 ) Preselect speed n=300rpm and radius r=100mm 2 ) The tree bodies m=54g, 79 g and 105g are utilized one after the other 3 ) The expected centrifugal force is calculated from the mass m in g as follows: 302 F=rω2m = r π2n2 m = 0.1π2 3002 m = 0.0987 m 302
4) Measured and calculated results are compared in table 2
Experiments 3: Centrifugal Force as a Function of Radius
1) Preselect the speed n=300rpm and mass=105g. 2) The body is consecutively inserted into engaging holes at 25, 50, 75, 100
and 125mm 3) The expected centrifugal force is calculated from the radius r in mm as
follows: F=mω2r = m π2n2 r = 0.105π 2 3002 = 0.1036r 302 302
. 4) Measured and calculated results are compared in table 2
6.0 RESULT / DATA Experiment 1: TABLE 1 Speed ,N(rpm)
