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It is known that a force with a moment of $960 \mathrm{N} \cdot \mathrm{m}$ about $D$ is required to straighten the fence post $C D$. If $d=2.80 \mathrm{m}$, determine the tension that must be developed in the cable of winch puller $A B$ to create the required moment about point $D$.

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$M_{A}=128.23 \mathrm{lb} \cdot \mathrm{ft}(\mathrm{CCW})$

Physics 101 Mechanics

Chapter 3

Rigid Bodies: Equivalent Systems of Forces

Moment, Impulse, and Collisions

Cornell University

Simon Fraser University

University of Winnipeg

McMaster University

Lectures

04:30

In classical mechanics, impulse is the integral of a force, F, over the time interval, t, for which it acts. In the case of a constant force, the resulting change in momentum is equal to the force itself, and the impulse is the change in momentum divided by the time during which the force acts. Impulse applied to an object produces an equivalent force to that of the object's mass multiplied by its velocity. In an inertial reference frame, an object that has no net force on it will continue at a constant velocity forever. In classical mechanics, the change in an object's motion, due to a force applied, is called its acceleration. The SI unit of measure for impulse is the newton second.

03:30

In physics, impulse is the integral of a force, F, over the time interval, t, for which it acts. Given a force, F, applied for a time, t, the resulting change in momentum, p, is equal to the impulse, I. Impulse applied to a mass, m, is also equal to the change in the object's kinetic energy, T, as a result of the force acting on it.

05:37

3.12 It is kown that force…

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03:01

Knowing that the tension i…

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