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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
The PocketLab One is tied to the end of a string through one of the loops on either end of the device and angular velocity and acceleration are measured as the PocketLab is spun in a circle using the string. (Click here for original tweet)
Getting some quantitative data from a cart rolling down an incline. Here, PocketLab One is attached to a cart and connected via Bluetooth to the PocketLab app. Acceleration of cart is being measured. (Click here for original tweet)
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.
PocketLab One on a journey through Splash Mountain. Here it survives a couple drops while measuring acceleration. Video was recorded using the PocketLab Video function in the app. (Original tweet here)