Questions and Answers
What does Statics focus on?
Which branch of Dynamics addresses the motion caused by forces?
What can a force do to a body?
Which unit is used to express force in the MKS system?
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What defines coplanar forces?
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Concurrent forces are described as forces that:
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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?
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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?
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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?
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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?
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What are coplanar concurrent forces?
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Which of the following describes non-coplanar non-concurrent forces?
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What is the resultant force?
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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?
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Which method is NOT used to find the resultant force of given forces?
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What characterizes non-coplanar concurrent forces?
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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.
