Physical Science
Raising hands over the head increases the reading on the scale, and when lowered, the vise verse occurs. This outcome is a clear explanation of Newton's Third Law of Motion. The simplest way to explain this phenomenon revolves around force and mass. The force that the body exerts needs to be balanced. The balance can only be achieved by another force that is equal but acting in the opposite direction (Rahman, 2016). Weighing machines use this principle to show the weight of an object placed on it.
The weight of one's body has a way to exert some force on a machine that is placed on it. The act of lifting the hands does not occur involuntarily. One has to exert some force to ensure that there is a balance between the pull of gravity and the upward movement of the hand. The force that tends to pull the hand down, therefore, increases the body weight. When this happens, the outcome is reflected on the scale as it tends to increase the reading. The vice versa also happens when one lowers the hand taking them to the original position. The difference is determined by the displaced weight and the strength of the gravity.
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Weight refers to the reaction force that ensures the body is well balanced. A body that is on the scale exerts pressure on it; hence the outcome is referred to as weight. The swift movement of the hands up in the air is acted upon by the force of gravity. The body temporarily becomes heavier. Swinging the hands upwards can, therefore, be easily read by the use of pounds and not kilograms (Rahman, 2016). Pounds measure force, which leads to an increase in body mass when lifting the hands. Therefore, the amount of increase in weight depends on the arm length and the time that one spends while lifting it.
References
Rahman, S. M., Ikeura, R., Nobe, M., & Sawai, H. (2016, January). Displacement-load force-perceived weight relationships in lifting objects with power-assist. In ICMIT 2009: Mechatronics and Information Technology (Vol. 7500, p. 75000S). International Society for Optics and Photonics.
