Jesús Carnicer Murillo, Francisco Reyes, Jenaro Guisasola Aranzábal
In introductory physics courses, within the context of studying Newton's laws, it is common to consider the problem of a body's �weight� when it is in free fall. The solution shows that the �weight� is zero1 and this leads to a discussion of the concept of weight.2,3 There are permanent free-fall situations such as astronauts in a spacecraft orbiting the Earth, for example, the International Space Station. However, it is important for an astronaut's health to control any variations in his/her body mass while on the orbiting spacecraft. This paper examines the following scenario: How can astronauts be weighed while in free fall
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