APPARATUS: Prony brake, scale, timer, stopwatch, 15 meter tape.
INTRODUCTION:
Let f = frictional force/unit length and n = normal
force/unit length
along the rope. For an element s =
along the rope,
let
and
be the tensions at opposite ends of
s. For small
, tensions
and
will be almost antiparallel and differ in magnitude,
, only by
the frictional force
. Thus
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![]() ![]() ![]() ![]() For the Prony brake, we integrate between ![]() ![]() ![]() . |
Note #1: For the Prony brake, ![]() which holds also for a slipping string if ![]() |
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SUGGESTIONS FOR PART B:
QUESTIONS:
Note #2: