This document discusses chapter 4 on statics from a textbook. It covers topics like torques, equilibrium of rigid bodies, center of gravity, stability and balance, levers and mechanical advantage. It provides examples of these concepts and how they apply to both engineering structures and biological structures like jaws, limbs, and backbones. Levers in the human body are discussed, like how muscles in the jaw and head act as levers. Sample problems are provided to calculate forces using information about levers.
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Methods of Interpreting Test Scores
Interpretation of test Scores
Referencing Framework
Percentage
Standard deviation
Ranking
Frequency Distribution
Pictoral Form
Here is a simplified version of Item Analysis for Educational Assessments. Covered here are terminologies, formulas, and processes in conducting Item Discrimination and Difficulty. Thank you. Namaste!
Methods of Interpreting Test Scores
Interpretation of test Scores
Referencing Framework
Percentage
Standard deviation
Ranking
Frequency Distribution
Pictoral Form
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The empire's roots lie in the city of Rome, founded, according to legend, by Romulus in 753 BCE. Over centuries, Rome evolved from a small settlement to a formidable republic, characterized by a complex political system with elected officials and checks on power. However, internal strife, class conflicts, and military ambitions paved the way for the end of the Republic. Julius Caesar’s dictatorship and subsequent assassination in 44 BCE created a power vacuum, leading to a civil war. Octavian, later Augustus, emerged victorious, heralding the Roman Empire’s birth.
Under Augustus, the empire experienced the Pax Romana, a 200-year period of relative peace and stability. Augustus reformed the military, established efficient administrative systems, and initiated grand construction projects. The empire's borders expanded, encompassing territories from Britain to Egypt and from Spain to the Euphrates. Roman legions, renowned for their discipline and engineering prowess, secured and maintained these vast territories, building roads, fortifications, and cities that facilitated control and integration.
The Roman Empire’s society was hierarchical, with a rigid class system. At the top were the patricians, wealthy elites who held significant political power. Below them were the plebeians, free citizens with limited political influence, and the vast numbers of slaves who formed the backbone of the economy. The family unit was central, governed by the paterfamilias, the male head who held absolute authority.
Culturally, the Romans were eclectic, absorbing and adapting elements from the civilizations they encountered, particularly the Greeks. Roman art, literature, and philosophy reflected this synthesis, creating a rich cultural tapestry. Latin, the Roman language, became the lingua franca of the Western world, influencing numerous modern languages.
Roman architecture and engineering achievements were monumental. They perfected the arch, vault, and dome, constructing enduring structures like the Colosseum, Pantheon, and aqueducts. These engineering marvels not only showcased Roman ingenuity but also served practical purposes, from public entertainment to water supply.
2. Outline
Torques
()العزوم
Equilibrium of Rigid Bodies
() توازن الجسام الجاسئة-الصلبة
Center of Gravity ()مركز الثقل
Stability and Balance ()الستقرار و التوازن
Levers; Mechanical Advantage
()الروافع: الفائدة اللية
Muscles ()العضلت
Levers in the Body (الروافع في جسم الكائنات
)الحية
The
3. Introduction
Statics
is the study of the forces acting on an
object that is in equilibrium and at rest.
Engineering structures: Bridges or buildings
Biological structures : Jaws (,)الفك
limbs( ,)اطرافor backbones(.)العمود الفقاري
Engineering, comparative anatomy(تشريح
,)مقارنphysical therapy( ,)العلج الطبيعيand
orthodonture (.)تقويم السنان
8. Types of equilibrium:
static
equilibrium: a state of equilibrium in
which the net external force and torque acting
on a system is zero
dynamic
equilibrium: a state of equilibrium in
which the net external force and torque on a
system moving with constant velocity are
zero
12. Example
Unlike
most of the other muscles in our
bodies, the masseter muscle()العضلة الماضغة
in the jaw, as illustrated in next slide, is
attached relatively far from the joint, enabling
large forces to be exerted by the back teeth.
(a) Using the information in the figure,
calculate the force exerted by the teeth on
the bullet.
(b) Calculate the force on the joint.
21. Glossary
torque:
turning or twisting effectiveness of a
force
perpendicular lever arm: the shortest distance
from the pivot point to the line along which F
lies
SI units of torque: newton times meters,
usually written as N·m
center of gravity: the point where the total
weight of the body is assumed to be
concentrated
22. Exercise 4-13
Find
the force F1 and F2 on the tooth in fig.
4.36 (In orthodonture, forces applied to the
teeth lead to forces on the supporting bones,
Gradually the bone tissue breaks down and
permits the tooth to rotate or translate. New
bone tissue grows in the space left behind.
The forces must be small enough to avoid
damaging the root of the tooth.
25. Exercise 37
The
head pivots about the atlanto-occipital
joint (Fig.4.46). The splenius muscles
attached behind the joint support the head.
(a) What class of lever does this represent?
Class 1
(b) The anterior muscles ()العضلت الماميةproduce
forward motions of the head. What class of
levers does their action represent? Class 3