This is essentially how I start my class each year. As educators we know that the primary way to ensure content retention is to connect the information to the students' lives in a relevant way. Thankfully, as physics teachers, we teach the subject that explains nearly every natural phenomenon in the world…and outside of the world, for that matter.…

Although mainly used by the hobby or "maker" crowd, the Arduino microcontroller has made its way into all levels of education, including physics labs. Perhaps the most compelling aspect of the Arduino in this regard is the ease with which it can be interfaced and acquire data from a sensor, using any one of its many analog inputs, SPI or…

A simple experimental setup using a smartphone and a pair of speakers is presented to perform an accurate experiment on interference of two point sources. The proposed experiment allows simple but interesting measurements to be done to introduce students to interference and diffraction phenomena. As such, the experiment effectively introduces the…

The standing vertical jump (SVJ) is a classical topic in Newtonian mechanics (Fig. 1). Although the topic has also been treated by others (other terms used are "standing high jump" or "squat jump"), the present paper shows how a smartphone can be used to capture video of a jump and determine the jump height. A crucial…

Chladni patterns are one of the most fascinating physics demonstrations. They can be produced very easily using commercially available apparatus based on metallic plates attached to a mechanical driver, similar to a loudspeaker without the membrane, and a signal generator. The figures are observed using sand sprinkled on the surface of the plate.…

The conventional approach to teaching blackbody radiation in introductory modern physics courses relies on an oversimplified explanation of Wien's displacement law, which does not uphold students' conceptual understanding of Planck's law and can lead to well-known misconceptions. Thus, there is a need to clarify the pedagogical role of this…

The role of work and mechanical energy in classical relativity has been a subject of renewed interest in this publication. Here we present a problem that illustrates the relationship between impulse and kinetic energy for a rocket-powered object that can also change its gravitational potential energy. The same introductory physics principles lead…

Students should have a strong conceptual understanding of the connection between force and acceleration before they start working with applications and problem solving. This has been discussed in the literature. During these days of flipped classroom instruction, an at-home activity could be especially valuable. I will describe an experiment with…

Python is a free, text-based programming language that has already been used by those who do physics research to great effect. But students can also learn to use it and, through its use, learn other aspects of physics--especially ones that are difficult or impossible to perform as physical labs. This article serves as a most-fundamental start for…

In the spring of 2018 the Northern California/Nevada Section of the American Association of Physics Teachers was alerted to a local high school's plans to eliminate physics for the following school year. As part of the campaign to support the school's efforts to sustain physics in the following year, the physics offerings from the surrounding…

Dark matter comprises most of the matter in the universe, yet physicists are unsure of its nature. A significant effort is devoted in contemporary research to attempts to understand dark matter, making it a both captivating and relevant area of astrophysics to discuss in a classroom setting. What is more, the physics behind these experiments is…

Fifty years ago this summer, three men aboard Apollo 11 traveled from our planet to the Moon. On July 20, 1969, at 10:56:15 p.m. EDT, 38-year-old commander Neil Armstrong moved his left foot from the landing pad of the lunar module (LM) Eagle onto the gray, powdery surface of the Sea of Tranquility and became the first person to step onto the…

The Roberval balance mentioned by E. Scott Barr presents a phenomenon against intuition that appears to violate the principle of torque equilibrium. Roberval called his balance a "static enigma." This apparent paradox went unexplained for well over a century until L. Poinsot in 1804 explained that the thrusts created in the parallelogram…

Observing the bouncing of a marble on a table is a rather common experience. The tic-tac sound of the rigid ball, nevertheless, carries quite a pleasant surprise. In fact, by measuring the total time of bouncing [delta]t, the coefficient of restitution can be estimated. As is well known, in an inelastic collision the kinetic energy is not…

What if energy flowed from cold to hot regions? How would thermodynamics be different? We examine such an imagined cold-to-hot world, abbreviated here as a C2H world, and show that the unfamiliar direction of energy flow implies that two thermally interacting objects at different temperatures will not equilibrate. We find that there is no…