Monday, October 5, 2009

For All Use words carefully

Many labs are plagued with sloppy writing of your thoughts or writing that reflects sloppy thinking. Words have meaning: the velocity is not the same as the rate of increase of velocity. Many of you say the acceleration is increasing when you should mean the acceleration is positive or non zero. Some of you have told me it is the acceleration that is increasing because the velocity is constant.



If the displacement is increasing at a constant rate then the velocity is not increasing, it is remaining constant.

If the velocity is increasing at a constant rate, it is the velocity that is increasing while the acceleration is constant. If the velocity is increasing at a constant rate, then the rate of increase of displacement is increasing. Note the double increase in this last phrase here.

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