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Questions and Answers
What is the term used to describe a moment of force that tends to rotate a body in an anticlockwise direction?
What is the term used to describe a moment of force that tends to rotate a body in an anticlockwise direction?
Which classification of moment of force describes a moment that tends to rotate a body about a fulcrum?
Which classification of moment of force describes a moment that tends to rotate a body about a fulcrum?
What type of moment tends to bend a body about one of its fixed ends?
What type of moment tends to bend a body about one of its fixed ends?
In which direction does a twisting moment act on a shaft?
In which direction does a twisting moment act on a shaft?
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What is the center of gravity in physics?
What is the center of gravity in physics?
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Which concept is fundamental to understanding the intact stability of a floating body?
Which concept is fundamental to understanding the intact stability of a floating body?
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What is the mathematical definition of moment of force?
What is the mathematical definition of moment of force?
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Which formula represents the moment of force?
Which formula represents the moment of force?
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In what unit is the moment of force measured in the SI system?
In what unit is the moment of force measured in the SI system?
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What type of moment is produced when a force rotates a body in a clockwise direction?
What type of moment is produced when a force rotates a body in a clockwise direction?
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What is the center of gravity of a body?
What is the center of gravity of a body?
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Which term refers to the division of moments based on their direction of rotation?
Which term refers to the division of moments based on their direction of rotation?
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What is the formula for calculating torque?
What is the formula for calculating torque?
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Which type of force acts perpendicular to the surface of contact between two objects?
Which type of force acts perpendicular to the surface of contact between two objects?
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What does the Frictional Force oppose?
What does the Frictional Force oppose?
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Which force can be either static or kinetic?
Which force can be either static or kinetic?
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What is the primary force responsible for causing motion, deformation, or internal stresses in a rigid body?
What is the primary force responsible for causing motion, deformation, or internal stresses in a rigid body?
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In the formula τ = rFsinθ, what does θ represent?
In the formula τ = rFsinθ, what does θ represent?
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Study Notes
Equilibrium of a Rigid Body
- Moment of force: the rotational tendency of a force, defined as the product of force and perpendicular distance from the point to the line of action of the force (M = F × d)
- Unit of moment of force: newton meter (N-m) in SI, newton centimeter (N-cm) in CGS
Types of Moment of Force
- Clockwise moment: when a force acting on a body has the tendency to rotate the body in a clockwise direction
- Anticlockwise moment: when a force acting on a body has the tendency to rotate the body in an anticlockwise direction
Classification of Moment of Force
- Turning moment: tends to rotate a body about a fulcrum
- Bending moment: tends to bend a body about one of its fixed ends
- Twisting moment: twists a shaft about one of its fixed ends
Center of Gravity
- Imaginary point in a body of matter where the total weight of the body may be thought to be concentrated
- Concept useful in designing static structures or predicting the behavior of a moving body acted on by gravity
Torque
- Magnitude given by the equation: τ = rFsinθ
- Where τ is the torque, r is the distance from the pivot point to the point where the force is applied, F is the magnitude of the force, and θ is the angle between the force and the vector directed from the point of application to the pivot point
Contact Forces on a Rigid Body
- Normal force (N): acts perpendicular to the surface of contact between the two objects, prevents interpenetration, and has a magnitude typically equal to the force pressing the objects together
- Frictional force (F): arises due to microscopic irregularities on the surfaces of the objects in contact, opposes relative motion, and has a magnitude dependent on the normal force and coefficient of friction
- Applied force (F): any external force exerted directly on the rigid body by another object, can have any direction and magnitude, and is responsible for causing motion, deformation, or internal stresses in the rigid body
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Description
This quiz covers the principles of moment of forces, the concept of the center of gravity of a body, types of contact forces on a rigid body, and calculations related to forces acting on a rigid body. Learn about rotational tendencies of forces and how they affect the equilibrium of rigid bodies.
