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Questions and Answers
What does Statics focus on?
What does Statics focus on?
Which branch of Dynamics addresses the motion caused by forces?
Which branch of Dynamics addresses the motion caused by forces?
What can a force do to a body?
What can a force do to a body?
Which unit is used to express force in the MKS system?
Which unit is used to express force in the MKS system?
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What defines coplanar forces?
What defines coplanar forces?
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Concurrent forces are described as forces that:
Concurrent forces are described as forces that:
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In which system is the magnitude of force expressed in newtons?
In which system is the magnitude of force expressed in newtons?
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Which of the following is NOT a type of system of forces?
Which of the following is NOT a type of system of forces?
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What is the resultant force of two forces of 100 N and 150 N acting at an angle of 45°?
What is the resultant force of two forces of 100 N and 150 N acting at an angle of 45°?
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Which law states that the resultant of two forces can be represented by the third side of a triangle?
Which law states that the resultant of two forces can be represented by the third side of a triangle?
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What does the Polygon Law of Forces extend?
What does the Polygon Law of Forces extend?
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If two forces are represented by two sides of a triangle, what must be true about their direction?
If two forces are represented by two sides of a triangle, what must be true about their direction?
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What describes the closing side of a polygon in the context of the Polygon Law of Forces?
What describes the closing side of a polygon in the context of the Polygon Law of Forces?
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In the Triangle Law of Forces, which of the following correctly describes the relationship between the two forces and their resultant?
In the Triangle Law of Forces, which of the following correctly describes the relationship between the two forces and their resultant?
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What are coplanar concurrent forces?
What are coplanar concurrent forces?
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Which of the following describes non-coplanar non-concurrent forces?
Which of the following describes non-coplanar non-concurrent forces?
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What is the resultant force?
What is the resultant force?
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What does the composition of forces refer to?
What does the composition of forces refer to?
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According to the parallelogram law of forces, how is the resultant of two forces represented?
According to the parallelogram law of forces, how is the resultant of two forces represented?
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Which method is NOT used to find the resultant force of given forces?
Which method is NOT used to find the resultant force of given forces?
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What characterizes non-coplanar concurrent forces?
What characterizes non-coplanar concurrent forces?
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What does the process of resolution involve?
What does the process of resolution involve?
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Study Notes
Introduction to Engineering Mechanics
- Engineering Mechanics is categorized into two main groups: Statics and Dynamics.
Statics
- Focuses on forces and their effects on bodies at rest.
Dynamics
- Examines forces and their effects on bodies in motion.
- Further divided into Kinetics and Kinematics.
Kinetics
- Studies the motion of bodies due to the application of forces.
Kinematics
- Analyzes motion without considering the forces that cause it.
Force
- Defined as an agent that produces or tends to alter the motion of a body.
- Example: A horse pulls a cart, applying force to start its motion.
Effect of a Force
- Forces can change, retard, or cause internal stresses in a body.
- Understanding force requires knowledge of its nature, magnitude, and line of action.
Unit of Force
- In the MKS system, force is measured in Kilogram force (kgf).
- In the SI system, force is measured in Newtons (N).
- Conversion: 1 kgf = 9.81 N.
System of Forces
- Two or more forces acting on a body create a system of forces.
- Categories include coplanar, collinear, concurrent, coplanar concurrent, coplanar non-concurrent, non-coplanar concurrent, and non-coplanar non-concurrent forces.
Coplanar Forces
- Forces whose lines of action lie in the same plane.
Collinear Forces
- Forces whose lines of action lie along the same line.
Concurrent Forces
- Forces that meet at a single point, can be collinear or non-collinear.
Coplanar Concurrent Forces
- Forces that meet at one point and lie in the same plane.
Coplanar Non-Concurrent Forces
- Forces that do not meet at one point but lie in the same plane.
Non-Coplanar Concurrent Forces
- Forces that meet at one point but do not lie in the same plane.
Non-Coplanar Non-Concurrent Forces
- Forces that neither meet at a point nor lie in the same plane.
Resultant Force
- A single force that can replace multiple forces acting on a particle, obtained through vector addition.
Composition of Forces
- The process of determining the resultant force from several given forces.
Methods for Resultant Force
- Analytical Method and Method of Resolution.
Analytical Method for Resultant Force
- Uses techniques like the Parallelogram Law of Forces and Method of Resolution.
Parallelogram Law of Forces
- States that if two forces are represented as adjacent sides of a parallelogram, their resultant is represented by the diagonal of the parallelogram.
Problem Example
- For two forces of 100 N and 150 N acting at a 45° angle, compute the resultant.
Laws for Resultant Force
- The resultant can also be found using the Triangle Law and Polygon Law of Forces.
Triangle Law of Forces
- Two forces can be represented as two sides of a triangle; the resultant is the third side taken in opposite order.
Polygon Law of Forces
- An extension of the Triangle Law for multiple forces, where the resultant is represented by the closing side of a polygon taken in reverse order.
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Description
This quiz provides an overview of Engineering Mechanics, exploring its two main divisions: Statics and Dynamics. Learn about the fundamentals of forces acting on bodies at rest and in motion, as well as the subcategories of Dynamics, including Kinetics and Kinematics.
