The importance of the definition of weight
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1 Science Education, Hebrew University, Jerusalem, Israel
* Corresponding Author
EUR J SCI MATH ED, Volume 2, Issue 2A, pp. 212-218.
https://doi.org/10.30935/scimath/9646
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ABSTRACT
Presented by the Newton definition of weight that identifies the weight with the force of gravity exerted on the body, at the ninth grade, results in miss- conceptions: gravity stops at the end of the atmosphere and needs air for its activity, gravitation is unique to earth does not act in other locations such as on the moon or Mars. There is no gravity in space. An astronaut orbiting around the earth is not affected by gravity. When these findings were researched at high school: at grades eleven and twelve, among students and teachers the same miss- conceptions were observed. No reduction of them was found. Differentiation between apparent and real weight did not improve the results. Facing these results it was suggested to change the definition of weight and choose the one that young pupils use: weight is the force exerted by the body on the hand or any other support including the scale. This definition assumes that free falling bodies have no weight. In this way continuity is achieved both with young pupils' definition and the assumption made in general relativity that falling bodies have no weight. Two research works were made using this definition and resulted with a significant reduction of the miss-conception and even vanishing of some of them. This result was achieved using two different instruction methods.
REFERENCES
- Bar, V., Zinn, B. and Rubin, E. (1997), Similar frameworks of action-at-a distance: Early scientist’s and pupils’ ideas, Science & Education, 7(5), 471-491.
- Bar, V., Zinn, B., (1998). Similar frameworks of action-at-a-distance: Early scientists’ and pupil’s ideas. Science Education 7, 471-491.
- Bar, V., Zinn, B., Goldmuntz, R., and Sneider, C. (1994). Children’s concepts about weight and free fall. Science Education, 78(2), 149-169.
- Depiero and Garafalo (2003). Using a Socratic Dialog To Help Students Construct Fundamental Concepts. Journal of chemical education, 80(12), 1408.
- Galili, I. and Kaplan, D. (1996). Students’ Operation with the Concept of Weight. Science Education, 80(4), 457-487.
- Galili, I. and Lehavi, Y. (2003). The importance of weightlessness and tides in teaching gravitation. American Journal of Physics, 71(11), 1127-1135.
- Galili, I. (1993). Weight and Gravity: teachers’ ambiguity and students’ confusion about the concepts. International Journal of Science Education, 15(1), 149-162.
- Galili, I. (2001). Weight versus gravitational force: Historical and educational perspectives. International Journal of Science Education, 23, 1073–1093.
- Galili, I. (2011). 'Promotion of Content Cultural Knowledge through the use of the History and Philosophy of Science', Science & Education, DOI 10.1007/s11191-011-9376-x
- Watts (1982). Gravity don’t take it for granted. Physics Education, 17(4), 116.