Reaction-Action-Activities relationship?
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From: Saimhain Moose on 18 Mar 2010 00:49 On Mar 18, 12:21 am, Kumar <lordshiva5...(a)gmail.com> wrote: > Are activities not dependant on applied forces? Exactly what do you mean by "activities"?
From: Kumar on 18 Mar 2010 06:28 On Mar 18, 9:49 am, Saimhain Moose <samhainmo...(a)hotmail.com> wrote: > On Mar 18, 12:21 am, Kumar <lordshiva5...(a)gmail.com> wrote: > > > Are activities not dependant on applied forces? > > Exactly what do you mean by "activities"? Something done as an action or a movement.
From: Kumar on 18 Mar 2010 06:30 On Mar 17, 7:33 pm, PD <thedraperfam...(a)gmail.com> wrote: > On Mar 16, 6:35 am, Kumar <lordshiva5...(a)gmail.com> wrote: > > > > > > > Hello, > > > Newton's third law is frequently stated > > > "Action and reaction are equal and opposite > > To every action there is an equal and opposite reaction" > > > Law is defined as; > > > The term law is often used to refer to universal principles that > > describe the fundamental nature of something, to universal properties > > and relationships between things, or to descriptions that purport to > > explain these principles and relationships.http://en.wikipedia.org/wiki/Law_(principle) > > > I have some questions:- > > > 1. Is it also true that "to every reaction there is equal and opposite > > action"? > > > 2. Can we consider action or reaction as activities or motions and as > > law hold universal application, whether above action reaction > > relationship will apply to all our activities? > > > Best wishes. > > The better way to say the third law is thus: > Interactions between bodies are always pairwise, so that what A exerts > on B, B exerts on A, in equal amount but in the opposite direction. > > "Exert" here is taken to mean either a force or a momentum transfer. > It does NOT mean the response to that exertion, which is seen as > motion of the body. > > As an example of this last distinction, consider the collision of a > mosquito with the windshield of a speeding truck. The force the > mosquito exerts on the truck is just as big as the force the truck > exerts on the mosquito. The momentum transferred from the mosquito to > the truck is just as big as the momentum transferred from the truck to > the mosquito. But the change in motion of the mosquito (the response > to the truck's interaction with it) is much larger than the change of > motion of the truck. > > PD- Hide quoted text - > > - Show quoted text - When a rubber ball hit to a wall it came back to us but not an iron ball? How it is justified in newtons 3rd law?
From: PD on 18 Mar 2010 09:35 On Mar 18, 5:30 am, Kumar <lordshiva5...(a)gmail.com> wrote: > On Mar 17, 7:33 pm, PD <thedraperfam...(a)gmail.com> wrote: > > > > > On Mar 16, 6:35 am, Kumar <lordshiva5...(a)gmail.com> wrote: > > > > Hello, > > > > Newton's third law is frequently stated > > > > "Action and reaction are equal and opposite > > > To every action there is an equal and opposite reaction" > > > > Law is defined as; > > > > The term law is often used to refer to universal principles that > > > describe the fundamental nature of something, to universal properties > > > and relationships between things, or to descriptions that purport to > > > explain these principles and relationships.http://en.wikipedia.org/wiki/Law_(principle) > > > > I have some questions:- > > > > 1. Is it also true that "to every reaction there is equal and opposite > > > action"? > > > > 2. Can we consider action or reaction as activities or motions and as > > > law hold universal application, whether above action reaction > > > relationship will apply to all our activities? > > > > Best wishes. > > > The better way to say the third law is thus: > > Interactions between bodies are always pairwise, so that what A exerts > > on B, B exerts on A, in equal amount but in the opposite direction. > > > "Exert" here is taken to mean either a force or a momentum transfer. > > It does NOT mean the response to that exertion, which is seen as > > motion of the body. > > > As an example of this last distinction, consider the collision of a > > mosquito with the windshield of a speeding truck. The force the > > mosquito exerts on the truck is just as big as the force the truck > > exerts on the mosquito. The momentum transferred from the mosquito to > > the truck is just as big as the momentum transferred from the truck to > > the mosquito. But the change in motion of the mosquito (the response > > to the truck's interaction with it) is much larger than the change of > > motion of the truck. > > > PD- Hide quoted text - > > > - Show quoted text - > > When a rubber ball hit to a wall it came back to us but not an iron > ball? How it is justified in newtons 3rd law? The transfer of momentum to the rubber ball is twice what it is to the iron ball. But the momentum transferred to the rubber ball is equal and opposite the momentum transferred to the wall in that collision. And the momentum transferred to the iron ball is equal and opposite the momentum transferred to the wall in that collision.
From: PD on 18 Mar 2010 09:36
On Mar 18, 5:28 am, Kumar <lordshiva5...(a)gmail.com> wrote: > On Mar 18, 9:49 am, Saimhain Moose <samhainmo...(a)hotmail.com> wrote: > > > On Mar 18, 12:21 am, Kumar <lordshiva5...(a)gmail.com> wrote: > > > > Are activities not dependant on applied forces? > > > Exactly what do you mean by "activities"? > > Something done as an action or a movement. They're not the same. A movement (specifically a change in movement) is the *response* to a force. The force is the cause, the acceleration is the effect. Motion is not a cause. |