A French watchmaker and physicist, Jean Charles A. Peltier, observed that electric currents produce heating or cooling at the interface between two dissimilar metals. This is now known as the Peltier effect and is used in numerous cooling applications, including air cooling of small refrigerators, beverage cooling in camping, cooling of electronic components, extraction of water in air by dehumidifiers, and cooling of CCDs in telescopes, spectrometers and cameras.
The physics of the sounds produced by music boxes is definitely worth studying in curricula based upon NGSS (Next Generation Science Standards). The prongs of a metal music box comb and an oscillating meter stick that overhangs a table are both examples of cantilevers--long projecting beams that are supported only at one end. Other common examples include many suspension bridges, beams that support balconies on high rises, diving boards, airplane wings, and flagpoles mounted to the side of a building.
In this lesson we develop a laboratory experiment in which students quantitatively verify a major theoretical equation for the Doppler Effect when the wave source is at rest with respect to the medium and the observer is moving through the medium. The waves are simulated waves on an iPad or similar device. Ozobot keeps Voyager moving at a known speed, either toward or away from the wave source.
PocketLab Voyager is perfect for performing an experiment on torsional harmonic oscillation. Voyager is taped to a mass hanging from a spring. The mass is given both an initial vertical translation and a torsional twist and then released. While simultaneously bobbing up-and-down and twisting back-and-forth, the two motions are recorded by Voyager. The period of the translational motion is recorded by the acceleration sensor. The angular velocity sensor concurrently records information for measuring the period of the torsional oscillation.
This lesson deals with what are commonly referred to as coupled pendulums, in which energy is transferred back-and-forth between the pendulums via the coupling. Pendulums coupled by springs are commonly studied in college physics classes during studies of simple harmonic motion. However, our lesson makes use of string-coupled pendulums, as they are easier and less expensive to construct.
It is quite well known that when two frequencies of sound are close together, beats are produced and heard. Demonstrations of this phenomenon are common in acoustical studies in physics classes. In this lesson we investigate three laboratory techniques for seeing beats instead of hearing them. These visual beats can be recorded and studied by the use of the PocketLab app and Voyager’s light sensor. The first technique uses two #50 lamps that are driven at slightly different AC sine wave frequenc
In this investigation we study a slowly varying sine wave signal produced by a function generator and amplified by a power amplifier to light a small #50 lamp. We are specifically interested in seeing the relationship between the light intensity of the lamp and the current it is carrying at any given instant of time. PocketLab Voyager is a perfect laboratory for performing this investigation even though Voyager does not have a current sensor.
As shown in the image accompanying this lesson, conservation of angular momentum can be investigated using a Lazy Susan (LS), PocketLab, and a compact weight. Voyager is mounted to the LS. The LS is given a spin and gradually slows down from friction. The compact weight is dropped just above the edge of the LS. The resultant sudden decrease in angular velocity is recorded by Voyager. The accompanying video shows all of this action. Taking into account the moment of inertia of the LS, and
Although there are a number of Web-based screen animations illustrating Kepler’s Law of Equal Areas, there are virtually no widespread physical demonstrations using actual hardware—at least not until Ozobot made the scene! Now with Voyager and Ozobot working together as a team, the motion can be visualized and studied quantitatively.