ISSN:0031-921X    

DOI:10.1119/1.879921

出版商:American Association of Physics Teachers    

年代:1998

数据来源: AIP

ISSN:0031-921X    

DOI:10.1119/1.879922

出版商:American Association of Physics Teachers    

年代:1998

数据来源: AIP

ISSN:0031-921X    

DOI:10.1119/1.879923

出版商:American Association of Physics Teachers    

年代:1998

数据来源: AIP

摘要:

What could be simpler? Exert a force on a mass, and it accelerates.F=ma! You can work that formula into any number of problems about objects on inclined planes, or Atwood's machine, or blocks sliding along a surface with coefficient of friction, μ.

ISSN:0031-921X    

DOI:10.1119/1.879926

出版商:American Association of Physics Teachers    

年代:1998

数据来源: AIP

摘要:

Presented here is a very simple physical model of flight that relies only on Newton’s second law and yet is able to reproduce all the salient features of a more rigorous fluid dynamical treatment. From a pedagogical point of view the model helps understand the origins of lift and drag in terms of forces rather than pressures, and enables all the important points to be made without recourse to complicated mathematics.

ISSN:0031-921X    

DOI:10.1119/1.879927

出版商:American Association of Physics Teachers    

年代:1998

数据来源: AIP

摘要:

A sonic ranger is used to measure the acceleration of a low-friction cart using data collected from its motion coasting up and down an incline. The uninitiated but experienced physics student may predict the accelerations up and down the incline to be equal. However, when a cart is rolled up an incline, the speed vs time graph produced by sonic ranger clearly shows a point of inflection when the cart reverses direction at its highest point on the ramp. The author then shows how the ratios of the accelerations can be used to determine the coefficient of friction for this event.

ISSN:0031-921X    

DOI:10.1119/1.879928

出版商:American Association of Physics Teachers    

年代:1998

数据来源: AIP

摘要:

We investigate the role of a classroom torsional wave machine as a science prop and teaching aid, having already considered the physics behinds its design and operation in a companion article last month. We now present a selection of experiments designed to compare theory with experiment, demonstrate basic wave phenomena, and introduce fascinating concepts such as cut-off frequency and dispersion.

ISSN:0031-921X    

DOI:10.1119/1.879929

出版商:American Association of Physics Teachers    

年代:1998

数据来源: AIP

摘要:

In this paper we describe some simple experiments involving the magnetic force on currents and electromagnetic induction.

ISSN:0031-921X    

DOI:10.1119/1.879930

出版商:American Association of Physics Teachers    

年代:1998

数据来源: AIP

摘要:

This paper describes the optics principles present in a newspaper photograph of the Seattle Space Needle; the optics of the image was incorrectly described in the caption.

ISSN:0031-921X    

DOI:10.1119/1.880121

出版商:American Association of Physics Teachers    

年代:1998

数据来源: AIP

摘要:

Holidays at Lemon Bay High are days of unusual activities, as they well may be at other high schools. One of our special days is Valentine’s Day. In order to maintain some academic focus in the physics department, while allowing my students to participate in the celebration, we’ve developed a physics version of the hearts-and-flowers February celebration. It’s Vectortine’s Day in physics class.

ISSN:0031-921X    

DOI:10.1119/1.879931

出版商:American Association of Physics Teachers    

年代:1998

数据来源: AIP