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Martell, Eric C.; Martell, Verda Beth – Physics Teacher, 2013
Atwood's machine is used in countless introductory physics classes as an illustration of Newton's second law. Initially, the analysis is performed assuming the pulley and string are massless and the axle is frictionless. Although the mass of the pulley is often included when the problem is revisited later in the context of rotational dynamics, the…
Descriptors: Mechanics (Physics), Science Equipment, Scientific Concepts, Science Instruction
Hughes, Bill; Mona, Lynn; Wilson, Greg; Seamans, Jeff; McAninch, Steve; Stout, Heath – Technology and Engineering Teacher, 2017
A handful of technological episodes: fire, wheel and axle, Industrial Revolution, Faraday's discovery of electromagnetic induction, the transistor, and the digital age, have historically altered humanity. We are now witnessing/participating in the next transformational technology: 3D printing. Although dating back nearly 30 years, the technology…
Descriptors: STEM Education, Printing, Information Technology, Technology Uses in Education
Brown, Todd – Physics Teacher, 2014
Although nuclear half-life is vital to physics and physical science, and to sensitive societal issues from nuclear waste to the age of the Earth, a true lab on half-life is almost never done at the college or high school level. Seldom are students able to use radioactivity to actually date when an object came into being, as is done in this…
Descriptors: Physics, Science Experiments, Spectroscopy, Primary Sources
Mungan, Carl E. – Physics Teacher, 2014
A Genecon is an inexpensive hand-cranked dc electric generator. You can use it to charge a one-farad supercapacitor. If you stop cranking the handle, the capacitor will discharge, sending a current into the Genecon and thereby causing the handle to start turning as an electric motor. How does the current direction compare before and after you stop…
Descriptors: Demonstrations (Educational), Physics, Motion, Mechanics (Physics)
Aguilar, Horacio Munguía; Maldonado, Rigoberto Franco – Physics Education, 2015
A simple capacitive cell for dielectric constant measurement in liquids is presented. As an illustrative application, the cell is used for measuring the degradation of overheated edible oil through the evaluation of their dielectric constant.
Descriptors: Physics, Measurement Techniques, Heat, Fuels
Mazlan, Rafidah; Kei, Joseph; Ya, Cheng Li; Yusof, Wan Nur Hanim Mohd; Saim, Lokman; Zhao, Fei – Journal of Speech, Language, and Hearing Research, 2015
Purpose: This study examined the effects of age and gender on wideband energy absorbance in adults with normal middle ear function. Method: Forty young adults (14 men, 26 women, aged 20-38 years), 31 middle-aged adults (16 men, 15 women, aged 42-64 years), and 30 older adults (20 men, 10 women, aged 65-82 years) were assessed. Energy absorbance…
Descriptors: Age Differences, Gender Differences, Adults, Young Adults
Daffron, John A.; Greenslade, Thomas B., Jr. – Physics Teacher, 2013
The Frahm resonance principle, in which resonating reeds indicate the frequency of mechanical or electrical oscillations, is a hardy perennial. In this note we will give some history, show some original apparatus, and show how it may be reproduced with relatively little effort.
Descriptors: Physics, Scientific Concepts, Science Equipment, Science History
King, Nicola; Van der Touw, Thomas; Spowart, Lucy; Lawlor, Craig – European Journal of Science and Mathematics Education, 2016
There has been an increasing movement towards the introduction of inquiry based learning in undergraduate physiology laboratories. Students can however find this challenging when there is a sudden transition from traditional didactic practicals to full inquiry based activities. One reason for this could be the students' perceptions about the…
Descriptors: Student Attitudes, Active Learning, Inquiry, Science Laboratories
Pfister, Hans – Physics Teacher, 2014
Physics students encountering electric circuits for the first time often ask why adding more resistors to a circuit sometimes increases and sometimes decreases the resulting total resistance. It appears that these students have an inadequate understanding of current flow and resistance. Students who do not adopt a model of current, voltage, and…
Descriptors: Physics, Equipment, Energy Education, Science Equipment
Cross, Rod; Lindsey, Crawford – Physics Teacher, 2014
The effect of the aerodynamic drag force on an object in flight is well known and has been described in this and other journals many times. At speeds less than about 1 m/s, the drag force on a sphere is proportional to the speed and is given by Stokes' law. At higher speeds, the drag force is proportional to the velocity squared and is…
Descriptors: Physics, Measurement Techniques, Measurement, Motion
Koehn, Theodore – Science Teacher, 2013
The author taught for years in rural high schools, where students often helped their parents out around the house or farm with chores, learning basic mechanical skills that he could then build on in class. Then the author taught in an urban high school, where student skills often centered on video games and other electronics. The author knew that…
Descriptors: Science Equipment, Physics, Science Laboratories, Science Instruction
Cross, Rod – Physics Teacher, 2013
A tippe top (see Fig. 1) is usually constructed as a truncated sphere with a cylindrical peg on top, as indicated in Fig. 2(a). When spun rapidly on a horizontal surface, a tippe top spins about a vertical axis while rotating slowly about a horizontal axis until the peg touches the surface. At that point, weight is transferred to the peg, the…
Descriptors: Mechanics (Physics), Geometric Concepts, Scientific Concepts, Science Instruction
Ng, Pun-hon; Chan, Kin-lok – Physics Education, 2015
In most secondary physics textbooks, waves are first introduced with examples of mechanical waves because they can be illustrated by drawings and photographs. However, these illustrations are static and cannot reflect the dynamic nature of waves. Although many mechanical waves (e.g. water waves and vibrating strings) can be easily shown using…
Descriptors: Scientific Concepts, Physics, Photography, Production Techniques
Zietz, Otto; Mylott, Elliot; Widenhorn, Ralf – Physics Teacher, 2015
Planar x-ray imaging is a ubiquitous diagnostic tool and is routinely performed to diagnose conditions as varied as bone fractures and pneumonia. The underlying principle is that the varying attenuation coefficients of air, water, tissue, bone, or metal implants within the body result in non-uniform transmission of x-ray radiation. Through the…
Descriptors: Radiation, Radiology, Clinical Diagnosis, Scientific Principles
Pathare, Shirish R.; Huli, Saurabhee; Lahane, Rohan; Sawant, Sumedh – Physics Teacher, 2014
Dropping a magnet into a conductive pipe (made up of copper or brass or aluminum) is a very popular demonstration in many physics classrooms and laboratories. In this paper we present an inexpensive timer that can be used to measure the terminal velocity of the magnet falling through a conducting pipe. The timer assembly consists of Hall effect…
Descriptors: Magnets, Motion, Measurement Equipment, Measurement Techniques