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Questions and Answers
Which branch of mechanics deals with the equilibrium of bodies?
Which branch of mechanics deals with the equilibrium of bodies?
Dynamics is concerned with bodies that are at rest.
Dynamics is concerned with bodies that are at rest.
True
What is considered a 'push' or 'pull' exerted by one body on another?
What is considered a 'push' or 'pull' exerted by one body on another?
Force
A _______ can be considered as a combination of a large number of particles that remain at fixed distances from each other.
A _______ can be considered as a combination of a large number of particles that remain at fixed distances from each other.
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Match the following terms with their definitions:
Match the following terms with their definitions:
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Which of the following statements reflects Newton's First Law of Motion?
Which of the following statements reflects Newton's First Law of Motion?
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The SI unit of force is the pound.
The SI unit of force is the pound.
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What does the variable 'g' represent in the equation for weight?
What does the variable 'g' represent in the equation for weight?
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In the metric system, mass is measured in ______.
In the metric system, mass is measured in ______.
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Match the following units with their corresponding systems:
Match the following units with their corresponding systems:
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Study Notes
Mechanics 1 - BSC 021
- Course instructor: Dr. Hewayda Elghawalby
- Course objective: To introduce basic quantities and idealizations in mechanics, explain Newton's Laws of Motion, review SI units, and demonstrate numerical calculation procedures.
- Chapter 1: General Principles
-
Chapter objectives:
- Introduce basic quantities and idealizations in mechanics
- Explain Newton's Laws of Motion
- Review SI units
- Demonstrate numerical calculation procedures
-
Chapter outline:
- Introduction
- Fundamental Concepts
- Units of Measurement
- Numerical Calculations
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Introduction
- Mechanics is a branch of physical science. It examines the state of rest or motion of bodies under force.
- Three branches of mechanics: rigid-body mechanics, deformable-body mechanics, and fluid mechanics.
- This course focuses on rigid-body mechanics, which is a fundamental requirement for the study of deformable bodies and fluid mechanics.
- Rigid-body mechanics is essential for the design and analysis of various engineering components, structures, and devices.
Rigid-Body Mechanics
- Subdivided into:
- Statics: Deals with the equilibrium of bodies at rest or moving at constant velocity.
- Dynamics: Concerned with the accelerated motion of bodies.
Fundamental Concepts
-
Basic Quantities:
- Length: Used to locate a point in space.
- Time: Conceived as a succession of events.
- Mass: Measures quantity of matter to compare actions of bodies.
- Force: Considered as a "push" or "pull" exerted by one body on another.
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Idealizations:
- Particle: Has mass but negligible size.
- Rigid Body: Combination of particles remaining at fixed distances both before and after loading.
- Concentrated Force: Represents the effect of a load acting at a point on a body.
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Newton's Three Laws of Motion:
- First Law: A particle at rest or moving at a constant velocity will remain in that state unless acted upon by an unbalanced force.
- Second Law: A particle acted upon by an unbalanced force will experience an acceleration in the same direction and magnitude proportional to the force (F = ma).
- Third Law: Mutual forces of action and reaction between two particles are equal, opposite, and collinear.
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Weight: Gravitational force on a particle near Earth's surface. Weight (W) = mass (m) * acceleration due to gravity (g).
Units of Measurement
- Two basic systems: English and Metric
- English system:
- Length: feet, inches
- Mass: slugs
- Force: pounds
- Time: seconds
- Pressure: pounds per square inch
- Metric system (SI units):
- Older form: centimeter-gram-second (cgs) system
- More modern form: System International (SI)
- Length: meters
- Mass: kilograms
- Force: newtons
- Time: seconds
- Pressure: pascals
Conversion of Units
- Table of conversion factors between English (FPS) and SI units for fundamental quantities.
- 1 ft = 12 in, 5280 ft = 1 mi, 1000 lb = 1 kip, 2000 lb = 1 ton
- Provides numerical values for conversion between units (lb to N, slug to kg, ft to m)
Numerical Calculations
- Engineering calculations often use calculators/computers
- Answers must have justified accuracy using appropriate significant figures.
- Important concepts: Dimensional Homogeneity, Significant Figures, and Rounding Off Numbers
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Description
This quiz covers the foundational concepts of Mechanics 1, focusing on the general principles related to Newton's Laws of Motion and fundamental quantities in mechanics. Students will review SI units and engage in numerical calculation procedures essential for understanding the subject.
