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이경서 ( Kyung Seo Lee ),강지원 ( Ji Won Kang ),곽민제 ( Min Je Kwak ),김기명 ( Ki Myong Kim ),김유빈 ( Yoo Bin Kim ),박병두 ( Byoung Du Park ),송규정 ( Kyu Jeong Song ) 전북대학교 과학교육연구소 2018 과학과 과학교육 논문지 Vol.43 No.1
The air movement inside interconnected two balloons was studied. Even if the radius of the initial radius, r<sub>0</sub> = 2.5 cm, increases to r = 2r<sub>0</sub>, the balloon is not deformed, and the restoring force acts and the self-elasticity is maintained. In the interconnected two balloons, it was confirmed that the air inside the volume of small balloon with high pressure moved toward the large volume balloon with low pressure. The air movement inside the two balloons was interpreted as the change of internal pressure according to the balloon size and the restoring elasticity of the balloon.
강지원 ( Ji Won Kang ),곽민제 ( Min Je Kwak ),김기명 ( Ki Myong Kim ),김유빈 ( Yoo Bin Kim ),이경서 ( Kyung Seo Lee ),박병두 ( Byoung Du Park ),송규정 ( Kyu Jeong Song ) 전북대학교 과학교육연구소 2018 과학과 과학교육 논문지 Vol.43 No.1
The equilibrium state of the ping pong ball held in the jet-air flow was studied. The forces acting in the equilibrium state of a ping pong ball held in the jet-air were analyzed by dividing the force of the component parallel to the jet-air flow direction and the force of the component perpendicular to the jet-air flow direction. It is explained that the ping-pong ball is held within the jet-air due to the Coanda effect. As the inclination angle of the jet-air flow increases, the increasing distance from the jet-air starting point to the floating ping-pong ball was measured. This is interpreted as the relationship between the force of the component parallel to the jet-air flow direction and the inclination angle of the jet-air flow.