A pendulum is a wave

Try vibrations and waves

A01 pendulum

A01.01 Thread pendulum, mathematical pendulum

A thread pendulum comes so close to the values ​​of a mathematical pendulum that one can study the theoretical predictions on it. There are three pendulums. Two have the same thread length and different pendulum masses, with which the same period of oscillation (T = 2s) can be shown. The thread length of the third pendulum is chosen so that half the period of oscillation (T = 1s) results.

Presentation: projection with an arc lamp

Evaluation: works

A01.02 spring pendulum

Spring pendulums with different springs and pendulum masses are built up. The oscillation periods can be compared with a stopwatch.

Presentation: direct or projection with an arc lamp

Evaluation: works

A01.03 ring pendulum
A01.04 Physical pendulum; Reversion pendulum

An extended body can be suspended from various pivot points. This results in different periods of oscillation, which are measured with a stopwatch.

A02 vibrations

A02.01 Synchronization of oscillation / rotary motion

A spring pendulum is projected next to a rotating disk with a pen using an arc lamp. If the oscillator amplitude and rotation frequency are set correctly, both movements are synchronous.

A02.02 vibrating liquid in the U-tube

There is colored water in a U-tube that can be made to vibrate.

A03 composite vibrations

A03.01 coupled gravity pendulum (small)

Two gravity pendulums are connected by a spring. This can be used to demonstrate movement in the same direction and in opposite directions as well as the exchange of energy between the pendulums.

A03.02 coupled gravity pendulum (large)
A03.04 Summer field pendulum

The Sommerfeld pendulum is a spring pendulum in which the oscillating mass has a pronounced moment of inertia. Therefore, the system can perform two oscillations. On the one hand the elastic longitudinal oscillation and on the other hand a torsional oscillation. After deflection, the types of oscillation alternate.

Presentation: direct or projection with an arc lamp

Rating: good

A03.05 torsional coupling
A03.06 triple pendulum
A03.07 Rottsche's pendulum
A03.08 Fundamental and harmonics of elastically connected balls
A03.10 electric beat
A03.11 acoustic beat
A03.12 Lissajous figure 2: 3 (pendulum thread)
A03.13 Lissajous figure (oscilloscope)
A03.16 Fourier synthesizer

A04 damped oscillations

A04.01 Spring pendulum dampened in water
A04.02 damped oscillation on LKS
A04.03 Pohlsche's rotating pendulum

A05 forced oscillations

A05.01 Pohlsche's rotating shaft
A05.02 Tongue Rate Monitor
A05.03 forced oscillation on LKS
A05.05 parametric oscillator (rocking principle)
A05.06 bridge film

A06 waves

A06.01 Water wave tray
A06.02 Sine wave model
A06.03 Wave machine
A06.04 small wave machine longitudinal / transversal
A06.05 Model phase and group velocity
A06.06 Film on phase and group speed
A06.07 two whips
A06.08 Hole siren
A06.09 Sound in a vacuum
A06.10 Rope waves

A07 standing waves

A07.01 Standing wave model

The model shows 2 sine waves and the standing wave resulting from the superposition of these waves.

A07.02 Rubensches flame tube
A07.06 Wooden balls between coil springs
A07.07 Vibrating string
A07.08 Kundt's pipe
A07.09 Resonance of a tuning fork
A07.10 Sound radiation
A07.11 Chladnian sound figures
A07.12 Coupling / feedback
A07.14 Vibration exciter with spring washer
A07.15 Vibration exciter with sound bars according to Chladni
A07.16 Vibration exciter with leaf springs
A07.17 Vibration exciter with vibrating string
A07.18 Quinck's pipe