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A crate of mass $80 \mathrm{kg}$ is held in the position shown. Determine $(a)$ the moment produced by the weight $\mathbf{W}$ of the crate about $E$,(b) the smallest force applied at $A$ that creates a moment of equal magnitude and opposite sense about $E,(c)$ the magnitude, sense and point of application on the bottom of the crate of the smallest vertical force that creates a moment of equal magnitude and opposite sense about $E$.

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a) $\quad M_{E}^{W}=196.20 \mathrm{Nm}$b) $\quad F=321.47 \mathrm{N}$c) $\quad P=230.82 \mathrm{N}$ acting upwards at point $\mathrm{D}$.

Physics 101 Mechanics

Chapter 3

Rigid Bodies: Equivalent Systems of Forces

Moment, Impulse, and Collisions

University of Michigan - Ann Arbor

Hope College

University of Sheffield

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.

06:05

A crate of mass $80 \mathr…

03:47

A crate of mass 87kg is he…

06:03

The force P is applied to …

04:32

A crate of weight $\mathbf…

05:32

A crate of weight $F_{g}$ …

03:25

A crate of weight $F_{R}$ …

03:23

04:01

The force $F$ (in pounds) …

00:59

You push a large crate acr…

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