ch 7 notes a - 7.2 Analyzing Interacting Objects-the...

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7.1 Interacting Objects -an interaction is the mutual influence of two object on each other -an action/reaction pair of forces exists as a apair, or not at all -the system is those objects whose motion we want to analyze and the environment as objects external to the system. -the interactions with objects in the environment are called external forces -the system-environment distinction is a practical matter, not a fundamental distinction -every force is one member of an action/reaction pair, and there is no suck thin as a true "external force" -a=F(1net)/m(1)=1/m(1) sigma(f(on 1)) -a=F(2net)/m(2)=1/m(2) sigma(f(on 2)) -forces exerted by object 1, such as F(1 on 2), do not appear in the equation for object 1. Bojects change their motion in response to forces exerted on them, not to forces exerted by them
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Unformatted text preview: 7.2 Analyzing Interacting Objects-the friction force f(p) (force of surface on person) is an example propulsion 7.3 Newton's Third Law-the Newton's thrid law extends and completes our concept of force. We can now recognize force as an interaction between objects rather than as some "thing" with an independent existence of its own.-the forces are equal but the accelerations are not-in an interaction between two objects of different mass, the lighter mass will do essentially all of the accelerating even though the forces exerted ont he two objects are equal-a well-defined relationship between the accelerations of two or more objects is called an acceleration constraint-a(Cx)=a(Tx)=a(x)...
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