3B SCIENTIFIC PHYSICS U8403950 Instruction Sheet - Page 4

Browse online or download pdf Instruction Sheet for Science Education products 3B SCIENTIFIC PHYSICS U8403950. 3B SCIENTIFIC PHYSICS U8403950 12 pages. Variable-g pendulum

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The effective gravitational field influencing the

periodic motion is reduced according to the

inclination of the plane of the pendulum relative

to the vertical. The axis of rotation lies along the

pointer, the inclination of which can be varied

between 0° und 90°.

The mass of the pendulum rod is small compared

to that of the pendulum bob (the discs), and

therefore the arrangement approximates closely to

an ideal mathematical pendulum, so that it is

described by the relationship:

⋅

⋅ π

⋅

cos

The length l of the pendulum can be assumed to be

the distance between the pendulum sleeve and the

lower surface of the pendulum bob.

The bob can be moved along the pendulum rod

and secured by means of a screw.

The pointer is provided with a hole into which it is

possible to screw a mounting rod (U8403955) for a

photo gate.

3. Equipment supplied

1 Pendulum rod

1 Disc with scale

1 Pointer

1 Pendulum bob

4. Technical data

Pendulum bob:

Length of pendulum rod:

Scale markings:

5. Operation

In order to carry out the experiments, the following

equipment is also required:

1 Stand base, A-shaped

1 Stainless steel rod

1 Mechanical stopwatch

1 Photo gate

1 Mounting rod for light barrier

1 Digital counter (230 V, 50/60 Hz) U8433341-230

1 Digital counter (115 V, 50/60 Hz) U8433341-115

Elwe Didactic GmbH ▪ Steinfelsstr. 6 ▪ 08248 Klingenthal ▪ Germany ▪ www.elwedidactic.com

3B Scientific GmbH ▪ Rudorffweg 8 ▪ 21031 Hamburg ▪ Germany ▪ www.3bscientific.com

300 g

350 mm

0° ... 90°

U8611150

U8611330

U40801

U11365

U8403955

Subject to technical amendments

•

Set up the instrument on a level surface using

the large stand base and rod, positioning it as

low as possible so that there is no risk of

tipping over.

•

Adjust the base so that the rod is exactly

vertical.

Set the angle of inclination α, by loosening the

•

knurled screw (6), moving the pendulum rod

and pointer to the required angle on the scale,

and re-tightening the screw.

To measure the frequency or period of the

pendulum, a photo gate (U11365) can be attached

using the mounting rod (U8403955) as shown in

Fig. 1.

Fig. 1 Variable-g pendulum with mounting rod and

photo gate