3B SCIENTIFIC PHYSICS 1018466 Manual de instruções - Página 3

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3. Description

The reversible pendulum is a physical pendulum

with two bearing fulcra plus one fixed and one

movable pendulum bob. It oscillates in its stand

either with a period of oscillation T

bearing fulcrum or period T

crum. By shifting the movable pendulum bob it is

possible to adjust both these periods until they

are equal. The pendulum then has a reduced

length equal to the distance d between the bear-

ing axes and the following equation applies:



  

g: acceleration due to gravity

When it is moved, the movable weight latches

into place every 2.5 cm. For finer movements the

bob can be turned by 180° about the vertical and

mounted that way round.

4. Technical data

Period of calibrated

pendulum (calculated

assuming g = 9.81 m/s

Overall dimensions:

Overall weight:

Length of pendulum rod:

Separation between

bearing fulcra:

Fixed pendulum bob:

Movable pendulum bob:

Pendulum deflection

5. Set-up

5.1 Choice of set-up location

If the floor on which the equipment is set is

springy, then the oscillation energy is transferred

to the whole stand and measurement errors can

then arise.



Only set up and use the reversible pendulum

on solid, level ground.

On smooth, slippery or sensitive surfaces:



Put a mat under the base plate and the strut

of the stand.

5.2 Assembly of stand



Undo the screw (see Fig. 1), fold out the

stand rod.



Secure it in its operating position with a mod-

erate degree of torque.

about the first

about the second ful-

1794 ms

80x125x30cm

6.3 kg approx.

120 cm

80 cm

1.4 kg approx.

1.0 kg approx.

max. 10 cm

Fig. 1: Attachment of stand rod to stand board

5.3 Vertical positioning of the pendulum rod



Grip the pendulum with both hands and care-

fully suspend it from the bearing plate (see

Fig. 2).



The vertical positioning of the pendulum rod

should be adjusted using the positioning

screws in such a way that the bubble of the

spirit level is centered (see Fig. 3).

Fig. 2: Bearing plate with pendulum rod suspended

Fig. 3: Setting position with the help of the spirit level