3B SCIENTIFIC PHYSICS 1018466 Instruction Manual - Page 4

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6. Operation

6.1 Moving the pendulum rod



Use gentle pressure to move the pendulum in

the direction of the arrow with several pushes

at the position marked until the deflection is

about 5 cm.

Note: Larger deflections can lead to non-negligi-

ble measurement errors.

Fig. 4: Moving the pendulum rod

6.2 Reversing the pendulum position



Use both hands to lift the pendulum out of the

bearing plate and turn it around.



Carefully suspend the pendulum from the

bearing plate by its other fulcrum. Then carry

on as in step 6.1.

Fig. 5: Experiment set-up with light barrier and digital

counter

6.3 Period of oscillation depending on the posi-

tion of the movable pendulum bob

Additionally required:

1 Light barrier

1 Digital counter (@230 V)

1 Digital counter (@115 V)



Set up the light barrier under the pendulum

rod while it is stationary and connect the bar-

rier to the digital counter (see Fig. 5).



Suspend the pendulum rod from the bearing

plate in such a way that both the fixed bob

(red) and the movable bob (blue) are below

their corresponding fulcra.



Attach the movable bob in the wedge-shaped

groove nearest to the fixed bob, i.e. the low-

est one. This position will subsequently be re-

ferred to as measuring point 1 (even when

the pendulum rod is suspended above the

other fulcrum).



Measure the period of oscillation and make a

note of it..



Keep moving the movable bob from one

groove to the next and secure it (measuring

points 2 – 13). In each case, measure the pe-

riod of oscillation and make a note of it.



Now suspend the pendulum rod from the

bearing plate in such a way that the fixed pen-

dulum bob (red) is above the relevant fulcrum

and the movable bob (blue) is below its bear-

ing.



Secure the movable pendulum bob in the

wedge-shaped groove nearest to the fixed

bob, i.e. the highest one. This position will

subsequently be referred to as measuring

point 1 (see above).



Measure the period of oscillation and make a

note of it.



Keep moving the movable bob from one

groove to the next and secure it (measuring

points 2 – 13). In each case, measure the pe-

riod of oscillation and make a note of it.



Plot a graph of the periods of oscillation de-

termined in both sets of measurements as a

function of the numbers n of the measure-

ments (see Fig. 6).

1000563

1001033

1001032