##### Development of applets
Especially in the engineering sciences and in physics, visual objects and experiments are an important part of teaching. For this reason, applets were developed within the framework of the BasicPlus project and later within the framework of the "Extended study entry phase" working group in the subject of physics, which clearly reproduce experiments and, in contrast to pure videos or simulations, also allow the linking of work assignments through the adjustability of parameters.

## Lopsided throw

Variation from vertical to horizontal throw possible. Target exercise (throw into the bucket) adjustable for playful changing of the parameters.

• the throwing speed,
• the throwing angle and
• the throwing height

Displayed are

• the location vector,
• the velocity, and
• the acceleration.

## Collision (1D)

Impact processes in the one-dimensional case.

• the masses of bodies 1 and 2,
• the velocities of bodies 1 and 2,
• whether the impact is elastic or completely inelastic.

Displayed are

• the individual impulses and the total impulse before and after the impact in the form of a graphic vector addition

## Collision (2D)

Impact processes in the two-dimensional case.

• the masses of bodies 1 and 2,
• the velocities of bodies 1 and 2,
• the collision angle for bodies 1 and 2.

The following are displayed

• the course of the collision with the magnitude and direction of the velocities of both bodies before and after the collision,
• the trajectory of the total impulse..,
• the individual impulses and the total impulse before and after the impact in the form of a graphic vector addition.

## Circular motion

Displayed are

• Position,
• velocity and
• acceleration of an object on a circular path

as it passes through the circular path and as a trigonometric function.

## Kepler's law

A driving beam drawn from the sun to the planet sweeps over equal areas in equal times.

• the eccentricity of the ellipse
• the display of the sectors (static/dynamic)

The following are displayed

• the position of the beam
• and the swept areas.

in the traversal of the elliptical path.

## (In)obedient role

Effect of the torque on the basis of a (in)following roller.

• angle of pull and
• force with which the thread is pulled.

Displayed are

• Lever arm and included angle,
• direction and speed of movement
• Direction of the acting torque as graphical representation of the cross product (schematic)

## Gyroscope

Effect of the weight force on a heavy gyro.

• the size of the additional mass
• the effect with and without rotation.

Displayed are

• the acting torques.

## Coriolis force

Effect of the Coriolis force on a rolling ball on a rotating circular disc.

• an observer position inside and outside the rotating system,
• a ball position from inside and outside,
• angular velocity,
• angle of throwing-in of the ball.

Displayed are

• acceleration and
• speed of the ball, as well as
• the rotation of the coordinate system

## Thermodynamik

Thermodynamics: Special changes of state

Representation of isochoric, isobaric, isothermal and adiabatic changes of state.

• the considered change of state and depending on it
• the state variables pressure, temperature and volume.

Displayed are

• the change of the system
• the corresponding pV-diagram

Representation of the relationships at the thread pendulum (mathematical pendulum).

The following are displayed

• the location,
• the velocity,
• the acceleration,
• the kinetic
• and potential energy.

## Damped vibration

The comparison of an undamped and a damped oscillation of a spring-mass oscillator is shown. The friction force is proportional to the magnitude of the velocity.

• the damping factor.

The following are displayed

• the damped
• or the undamped vibration,
• the corresponding formula set with coloured assignment,
• the energy balance (graphical representation).

## Forced oscillation

Representation of forced mechanical vibration.

• Damping factor
• Excitation frequency
• Excitation amplitude.

Displayed are

• Amplitude and phase response of the forced oscillation.

## Coupled Pendulum

Representation is the emergence of waves as transmission of oscillations by coupled pendulums.

• the initial deflection for pendulum 1,
• the initial deflection for pendulum 2,
• the spring constant (and thus the strength of the coupling).

The following is displayed

• the momentary deflection of both pendulums.

## Longitudinalwelle

Representation of the propagation of a longitudinal wave.

• the single or sinusoidal excitation.

The following are displayed

• the oscillation of the single particle
• the propagation of the wave as pressure fluctuation in space.

## Suspended animation

Display of a beat caused by the superposition of two oscillations with slightly different frequencies.

• the weight on the tuning fork (or the size of the frequency deviation),
• the circular frequency omega,
• the phase velocity.

Displayed are

• the single oscillation of the right and left tuning fork (single and superimposed),
• the beat as the result of the superposition of the two individual oscillations.

## Standing wave

Representation of a wave which is reflected at a loose/fixed end.

• Reflection at the fixed end or
• reflection at the loose end
• damping.

The following are displayed

• the incident wave,
• the reflected wave,
• the standing wave (sum of both waves).

## Doppler effect

Display of the Doppler effect for a moving source and/or a moving receiver.