摘要:

Momentum conservation and energy loss in collisions can be introduced intuitively by first considering the situation in which the total momentum is zero. Other cases, such as collision with a stationary object, are easily described by transforming the velocities of the zero momentum result. All two body, one-dimensional collisions can be easily treated this way without the need for solving simultaneous equations. Treatment of the general case leads immediately to conservation of momentum and to Newton’s law of elasticity.

ISSN:0031-921X    

DOI:10.1119/1.880104

出版商:American Association of Physics Teachers    

年代:1998

数据来源: AIP

摘要:

Addition of primary additive colors of light using red, green, and blue lightsticks. Demonstrations of the addition of primary colors red, green, and blue to produce white, yellow, magenta, and cyan using three commercially available lightsticks and a variable speed drill are discussed. The demonstrations are applicable for junior-high and high school science, physics, or chemistry classes.

ISSN:0031-921X    

DOI:10.1119/1.880105

出版商:American Association of Physics Teachers    

年代:1998

数据来源: AIP

摘要:

A suitable vacuum system for use on an overhead projector, students are able to readily see the three phases of water.

ISSN:0031-921X    

DOI:10.1119/1.880106

出版商:American Association of Physics Teachers    

年代:1998

数据来源: AIP

摘要:

Extensive field tests of four new introductory physics courses, in which the new models were compared with more traditional courses, have yielded many results. The most interesting of these are not directly related to how the new models fared, but instead to general features shared in common by many physics courses. The theme is simply that it is important to set concrete and well-defined goals, and to design every in- and out-of-class activity so that the students’ time is devoted to achieving those goals.

ISSN:0031-921X    

DOI:10.1119/1.880107

出版商:American Association of Physics Teachers    

年代:1998

数据来源: AIP

摘要:

We present here a collection of small and quick demos that require no equipment beyond what is present in the lecture room (chalk, chairs, students, books, paper, backpacks and their contents). Some are to prove something, but most are to illustrate, visualize, or simulate.

ISSN:0031-921X    

DOI:10.1119/1.880108

出版商:American Association of Physics Teachers    

年代:1998

数据来源: AIP

摘要:

The Maxwell wheel motion is experimentally investigated by interfacing the system to a PC with a force sensor and a position sensor. Mechanical energy transformations and the impluse-momentum theorem during the “collision” at the end of the string are studied.

ISSN:0031-921X    

DOI:10.1119/1.880109

出版商:American Association of Physics Teachers    

年代:1998

数据来源: AIP

摘要:

We use the stroboscopic effect to explain how a moving object seen on television can appear to be moving in an opposite direction and/or at velocities different from its true velocities.

ISSN:0031-921X    

DOI:10.1119/1.880110

出版商:American Association of Physics Teachers    

年代:1998

数据来源: AIP

摘要:

A portable Faraday’s law demonstration is described. A rare-earth magnet is dropped down a vertical guide tube passing through a small coil attached to a flashbulb. Reliable flashbulb firing occurs for a magnet fall of 15 cm.

ISSN:0031-921X    

DOI:10.1119/1.880111

出版商:American Association of Physics Teachers    

年代:1998

数据来源: AIP

摘要:

We present a simple experiment using a force sensor to investigate the uniform circular motion of a conical pendulum.

ISSN:0031-921X    

DOI:10.1119/1.880112

出版商:American Association of Physics Teachers    

年代:1998

数据来源: AIP

ISSN:0031-921X    

DOI:10.1119/1.1527614

出版商:American Association of Physics Teachers    

年代:1998

数据来源: AIP