Analysis of the Free Fall Experiment

1973 ◽  
Vol 41 (8) ◽  
pp. 965-968
Author(s):  
Clyde L. Humphrey
Keyword(s):  
Free Fall ◽  
Fall Experiment

Laboratory test of the Galilean universality of the free fall experiment

2014 ◽  
Vol 49 (2) ◽  
pp. 201-210 ◽  
Author(s):  
Rasmus S Christensen ◽  
Ricky Teiwes ◽  
Steffen V Petersen ◽  
Ulrik I Uggerhøj ◽  
Bo Jacoby
Keyword(s):  
Laboratory Test ◽  
Free Fall ◽  
Fall Experiment

The free fall experiment

Resonance ◽  
2016 ◽  
Vol 21 (3) ◽  
pp. 259-275 ◽  
Author(s):  
Dubravko Horvat ◽  
Radomir Jecmenica
Keyword(s):  
Free Fall ◽  
Fall Experiment

Constraints on gravitational properties of antimatter from cyclotron-frequency measurements

2014 ◽  
Vol 30 ◽  
pp. 1460260
Author(s):  
Michael H. Holzscheiter
Keyword(s):  
Gravitational Field ◽  
Gravitational Force ◽  
Normal Gravity ◽  
Free Fall ◽  
Gravitational Acceleration ◽  
Technical Problems ◽  
Weak Equivalence Principle ◽  
Normal Matter ◽  
Gravitational Experiment ◽  
Fall Experiment

A fundamental question in physics that has yet to be addressed experimentally is whether particles of antimatter, such as the antiproton or positron, obey the weak equivalence principle (WEP). Several theoretical arguments have been put forward arguing limits for possible violations of WEP. No direct `classical' gravitational experiment, the measurement of the free fall of an antiparticle, has been performed to date to determine if a particle of antimatter would experience a force in the gravitational potential of a normal matter body that is different from normal gravity. 30 years ago we proposed a free fall experiment using protons and antiprotons, modeled after the experiment to measure the gravitational acceleration of a free electron. At that time we gave consideration to yet another possible observation of gravitational differences between matter and antimatter based on the gravitational red shift of clocks. I will recall the original arguments and make a number of comments pertaining to the technical problems and other issues that prevented the execution of the antiproton free fall measurement. Note that a different gravitational force on antimatter in the gravitational field of matter would not constitute a violation of CPT, as this is only concerned with the gravitational acceleration of antimatter in the gravitational field of an antimatter body.

scholarly journals A study on the hydrodynamic performance of manta ray biomimetic glider under unconstrained six-DOF motion

PLoS ONE ◽  
2020 ◽  
Vol 15 (11) ◽  
pp. e0241677
Author(s):  
Wen-Hao Cai ◽  
Jie-Min Zhan ◽  
Ying-Ying Luo
Keyword(s):  
Numerical Simulation ◽  
Center Of Mass ◽  
Free Fall ◽  
Hydrodynamic Performance ◽  
Dynamic Update ◽  
Fall Experiment ◽  
Six Dof ◽  
The Stability ◽  
Manta Ray ◽  
Mesh Update

A manta ray biomimetic glider is designed and studied with both laboratory experiments and numerical simulations with a new dynamic update method called the motion-based zonal mesh update method (MBZMU method) to reveal its hydrodynamic performance. Regarding the experimental study, an ejection gliding experiment is conducted for qualitative verification, and a hydrostatic free-fall experiment is conducted to quantitatively verify the reliability of the corresponding numerical simulation. Regarding the numerical simulation, to reduce the trend of nose-up movement and to obtain a long lasting and stable gliding motion, a series of cases with the center of mass offset forward by different distances and different initial angles of attack have been calculated. The results show that the glider will show the optimal gliding performance when the center of mass is 20mm in front of the center of geometry and the initial attack angle range lies between A0 = -5° to A0 = -2.5° at the same time. The optimal gliding distance can reach six times its body length under these circumstances. Furthermore, the stability of the glider is explained from the perspective of Blended-Wing-Body (BWB) configuration.

Comment On: “Analysis of the Free Fall Experiment”

1974 ◽  
Vol 42 (12) ◽  
pp. 1121-1123
Author(s):  
Mark A. Heald
Keyword(s):  
Free Fall ◽  
Fall Experiment

scholarly journals Studying a free fall experiment using short sequences of images

2008 ◽  
Vol 134 ◽  
pp. 012032
Author(s):  
Francisco Vera ◽  
Cristian Romanque
Keyword(s):  
Free Fall ◽  
Fall Experiment
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