I was reading this article and started to wonder if "flat penny" is really the most likely configuration. http://www.livescience.com/18832-penny-dropped-skyscraper.html?utm_content=LiveScience&utm_campaign=seo%2Bblitz&utm_source=twitter.com&utm_medium=social%2Bmedia
Hi,
An object is falling near the surface of the Earth. We assume there is a drag force acting on it due to the air molecules. It's initial conditions are such that it rotates and is in a chaotic motion.
Will the object will fall in the end in such a way to minimize air drag? And if yes -...
It gets better. Thanks.
Energy absorbed by car equals its kinetic energy (assuming head-on collision and that both cars stop after), so work done by average force on the car is
F_{aver}d = -\frac{1}{2}mv^2
where d is the deformation of the car.
From 2nd Newton's law the average force is equal...
As I understand, usually a coordinate system (CS) must be introduced. Then forces must be classified into two. First half will be on the x axis, the other - y. In the case of gravitation - you draw it, as well as its components in this CS.
Force caused by gravitation will be split into two components depending of your inclination. One will be opposite to the normal force, but other will make your object accelerate if friction force is surpassed.
Hi,
I got confused thinking about cause and effect. If force is applied to a car due to collision, it deforms car. The longer is the time of a collision, the smaller is average force applied. Longer time is achieved by crumple zone deformation, which is affected by force. I find here circular...
Hi,
Our sensation of weight is given by gravity together with normal forces. It is said that in a swing you'll feel weightless at the top of the ride (180 degrees), because there is no seat that gives you normal force. But from my experience there is something strange even before 180 degrees...
Hi,
I write here for the first time and i hope so far i am doing everything properly :rolleyes:
I am writing about Electronic Article Surveillance (EAS) for my college (University of Latvia), it's popular science homework. This is not very common subject in latvian books so I had to read...