Published in Physics Education
In this work, the second generation of Lato Lato (Lato Lato 2.0) has been used to demonstrate the concept of conservation of momentum. The Lato Lato 2.0 toys are two identical solid balls that are attached to the stick handle via a stick. The balls are meant to rotate in response to the movements of the stick handle. With the assistance of these to...
Published in Physics Education
Newton’s cradle is commonly used to show that a collision of three or more identical balls in a row is one that conserves momentum and kinetic energy. An experiment is described where one billiard ball collides at an angle with another two at rest. The collision also conserves momentum and kinetic energy and has several surprisingly simple outcomes...
Published in Physics Education
A collision of one object with two or more objects is relatively complicated in general, but a simple example is provided by Newton’s cradle since all the objects are identical and in line. In the present paper, an experiment is described where a heavy mallet collides head-on with two billiard balls. The two conservation equations indicate that man...
Published in Physics Education
When two billiard balls collide head-on on a smooth, horizontal surface, momentum and kinetic energy are both conserved to a good approximation. If the experiment is repeated with two rubber balls, then kinetic energy is not conserved and neither is momentum. The latter result can be explained in terms of the external friction forces involved.
Published in Journal of Physics A: Mathematical and Theoretical
Since a classical charged point particle radiates energy and momentum it is argued that there must be a radiation reaction force. Here we present an action for the Maxwell–Lorentz without self-interactions model, where each particle only responds to the fields of the other charged particles. The corresponding stress–energy tensor automatically cons...
Published in Journal of Vibroengineering
The double-layer high-frequency vibrating screen machine is widely used in the tobacco industry, and its controllability of vibration has a great influence on the screening quality of cut tobacco. In this paper, we obtain the factors affecting the motion characteristics of the vibrating screen by theoretical derivation and experimental measurement ...
We discuss the two-ball bounce problem of obliquely aligned balls. If one drops two balls without a rod which keeps two balls vertical, the upper ball obtains the horizontal component of its velocity after the sequential bouncing. Finally, it lands on the ground far from the bouncing point. As a practice for students in calculus-based Physics cours...
The flow field in the near wake of a 1:5.5 bobsleigh model was investigated by means of stereoscopic particle image velocimetry. The time-averaged flow field revealed two counter-rotating vortices and a strong downwash between them. From the velocity field, the aerodynamic drag was retrieved invoking the conservation of momentum. This approach enab...
Published in Multiphase Flow Analysis Using Population Balance Modeling
Both the translational velocity and the angular velocity of the Earth change during a spacecraft launching process, in which a spacecraft is accelerated from the ground and eventually sent into space. This article presents a systematic study of the role played by the changes in the translation and rotation of the Earth in spacecraft launching. Negl...
