- published: 18 Dec 2012
- views: 224070
As described by the third of Newton's laws of motion of classical mechanics, all forces occur in pairs such that if one object exerts a force on another object, then the second object exerts an equal and opposite reaction force on the first. The third law is also more generally stated as: "To every action there is always opposed an equal reaction: or the mutual actions of two bodies upon each other are always equal, and directed to contrary parts." The attribution of which of the two forces is the action and which is the reaction is arbitrary. Either of the two can be considered the action, while the other is its associated reaction.
When something is exerting force on the ground, the ground will push back with equal force in the opposite direction. In certain fields of applied physics, such as biomechanics, this force by the ground is called 'ground reaction force'; the force by the object on the ground is viewed as the 'action'.
When someone wants to jump, he or she exerts additional downward force on the ground ('action'). Simultaneously, the ground exerts upward force on the person ('reaction'). If this upward force is greater than the person's weight, this will result in upward acceleration. When these forces are perpendicular to the ground, they are also called a normal force.
Reaction may refer to: Response to another event
This physics video explains the concept of nuclear fission reaction by illustrating an example of nuclear fission of Uranium 235 atom. Nuclear fission is nuclear reaction process in which nucleus, when bombarded with a neutron, splits into smaller parts, often producing free neutrons, and releasing a very large amount of energy. One of the most important applications of nuclear fission reactions in creating chain reactions.
A domino can knock over another domino about 1.5x larger than itself. A chain of dominos of increasing size makes a kind of mechanical chain reaction that starts with a tiny push and knocks down an impressively large domino. Original idea by Lorne Whitehead, American Journal of Physics, Vol. 51, page 182 (1983). See http://arxiv.org/abs/physics/0401018 and http://arxiv.org/abs/1301.0615 for sophisticated discussions of the physics. As seen on QI in the "kinetic" episode. I was contacted by those Elves. http://youtu.be/9jzlUEpXK48?t=39m30s
The Normal Force is Not a Reaction Force to Gravity!
This video is part of an all nuclear playlist: https://www.youtube.com/playlist?list=PLlbis7m6MHoEh6dc23kz22kW_Fcrd7LHO
I just received my SAT subject tests scores for Math II and Physics, and I decided to share my initial reaction and scores! Aren't I promiscuous? Wait, I don't think that's the right word. Links if annotations DON'T WORK... My SAT Scores (November 2014) [Reaction + FAIL]: http://youtu.be/c_5G29pce8U How to Pass AP US History and the Exam: http://youtu.be/zGkT2R4ogow With that being said, I'll see you next Thursday! ----------------------------------------------------------------------------- Facebook: http://on.fb.me/1k9Pa7D Twitter: https://twitter.com/Integratioon
Nuclear Fusion | Fusion energy explained with Hydrogen atom example | Physics animation video In this video we will understand how to or more nucleons merge or fuse together to create something more powerful and meaningful. Let us first understand the meaning of the word NUCLEAR FUSION, Nuclear meaning the process which involves Nucleus and Fusion in English means two or more entities coming together or merging together to form one single entity. So, nuclear fusion can be simply defined as the fusion or Combination of Nuclei. Scientifically, Nuclear Fusion can be defined as a nuclear reaction, in which lighter nuclei are combined together to form heavier product nuclei with the release of enormous amount of energy. Lighter Nuclei such as Lithium and Helium when combined together form a He...
screencast explaining normal reactions forces VCE physics unit 3
Matthew Burgos Luis Chabes Demarion Thomas --------------------------------- History of Radioactivity Types of Nuclear Reactions Types of Radioactive decay or emissions Characteristics of those emissions How to balance a nuclear reaction fission vs fusion nuclear fission in nuclear power plants pros and cons of nuclear power
Physics project about reaction time
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