Physics 173 Internet Question of the Week


The Questions

March 30 - April 3, 1998

Question #1:

This week's Internet search question of the week pertains to the analysis of motion using the work-energy theorem. The sites which you will browse are The Physics Classroom and the Multimedia Physics Studios. These two sites are actually located at the same site - which happens to be a high school site. Use a major search engine to find either The Physics Classroom or the Multimedia Physics Studios (unless you already know where they are located). The most useful search engines to use for this task are HotBot (www.hotbot.com), Lycos (www.lycos.com) and Alta Vista (www.altavista.com). If you find The Physics Classroom, then navigate to the Multimedia Physics Studios using the links from that page. (If you already know the location of these sites, then of course it is not necessary to use the search engines.)

Once you have found the homepage of the Multimedia Physics Studios, do the following:

  1. Identify the URL (address) of the home page of the Multimedia Physics Studios.
  2. Describe the search path which you took to find the page (see example description).
  3. Browse through the homepage and look at the variety of animations under the topic of Work and Energy. (NOTE: if you have an outdated AOL browser and haven't updated recently, then you probably won't be able to view the animations. Use the Internet connection at the school or get an updated browser from AOL.) Two of the work-energy animations are directly related to labs which we did during this week and the other animations merely depict the use of the work-energy theorem as a useful tool for the analysis of motion. View the animations and answer the following questions. (Do a bang-up job on this question; it is worth two of the three extra credit points. Besides, by learning well, you will be prepared for the upcoming unit.)
    1. Identify by name the two animations which relate directly to this week's labs.
    2. Describe one of these two animations and explain the use a couple of complete sentences to summarize the major point of the animation.
    3. Pick another animation from among the remaining animation, describe the animation and summarize the mahor point of the animation.
    4. For the animation which you pick in part c above, suggest one modification of the motion (e.g., suppose that the mass is greater, that friction and/or air resistance is present or absent, that the angle of an incline is greater or less, that the initial height is greater or less, etc.). Then describe the effect that such a modification would have on variables such as final height, final speed, amount of work done, final kinetic energy, final potential energy, etc.

 

Question #2:

A hockey player supplies an average force of 47.6 N over a distance of 39.1 cm in order to accelerate the puck to a higher speed. Before the application of the force, the 0.359-kg puck was moving with a speed of 6.55 m/s. Use the work-energy theorem to determine the final speed of the puck after teh application of the force. (Assume the ice is frictionless.) PSAYW

 


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