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ERIC Number: EJ982395
Record Type: Journal
Publication Date: 2012-Mar
Pages: 1
Abstractor: As Provided
ISBN: N/A
ISSN: ISSN-0031-921X
EISSN: N/A
Available Date: N/A
Why Multiply by "g"?
Nelson, Jane Bray
Physics Teacher, v50 n3 p161 Mar 2012
As a new physics teacher, I was explaining how to find the weight of an object sitting on a table near the surface of the Earth. It bothered me when a student asked, "The object is not accelerating so why do you multiply the mass of the object by the acceleration due to gravity?" I answered something like, "That's true, but if the table were not there, the object would accelerate at that rate." The really determined students might go on to ask, "Yes, but what if the object were already sitting on the surface of the Earth?" About that time, I would hope the bell would ring so that this whole discussion could be delayed until the next day. The next day, I would explain that the newton unit is the same as a kg-m/s[squared], so multiplying the mass in kilograms times the acceleration due to gravity would give an answer in newtons. It all made sense to me, but I am sure that the students just went along with me to get the right answer. (Contains 1 table and 2 figures.)
American Association of Physics Teachers. One Physics Ellipse, College Park, MD 20740. Tel: 301-209-3300; Fax: 301-209-0845; e-mail: pubs@aapt.org; Web site: http://scitation.aip.org/tpt
Publication Type: Journal Articles; Reports - Descriptive
Education Level: N/A
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A
Grant or Contract Numbers: N/A
Author Affiliations: N/A