Purpose
The purpose of this activity was to measure the centripetal force on a swinging
pendulum and then compared the force that was measured to the calculated force using
the speed of the pendulum as well as the radius. An additional purpose of this activity is
to measure the angular position and the velocity of a rotating body that is under a
constant angular acceleration.
Theory
A.
Centripetal forces keep objects moving in a circular path. For pendulums, the
centripetal force changes as the pendulum swings back and forth and is
dependent on mass, speed, and radius of motion. Using the equation,
Fc=mv^2/r=mrώ^2 we can calculate the centripetal force acting on a pendulum.
B. For every quantity of displacement, velocity, mass, etc. there is an equivalent
quantity in rotational kinematics and all linear quantities have rotational counterparts.
The kinematic equations for constant angular acceleration are used to solve
problems of rotational motion Ω=1/2(ώ0+ώ)t
Procedure
A.
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 Spring '10
 h
 Physics, Force

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