PASCO ME-9821 Centripetal Force Pendulum - Manual (Page 9)

Centripetal Force Pendulum Model No. ME-9821
8 ®
Table 1a
Table 1b
Calculations
1. Calculate the expected centripetal force using the measured angular
speed,
2. where m is the mass of the clamp-on mass (neglecting the mass of
the rod), r is the radius of the rotation (the length of the pendulum),
is the angular speed, and v (=r ) is the tangential speed of the
clamp-on mass. Record your results in Tables 1a and 1b.
3. Compare this force to the measured force using a percent
difference [(measured force-expected force)/(measured force) x
100]. Record your results in Table 1b.
Trial
Number Release
Angle
(Degrees) Maximum
Angular
Velocity(
)
Tangential
Speed (v) Expected
Force (N)
1
2
3
4
Trial
Number Release
Angle
(Degrees) Measured
Centripetal
Force (N) Expected
Centripetal
Force (N) Percent
(%)
Difference
1
2
3
4
ω
F mr
ω
2 mv 2
( ) r ⁄
= =
ω ω