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Questions and Answers
What is the primary characteristic of a first class lever?
What is the primary characteristic of a first class lever?
- The effort is applied at the end of the lever opposite the load.
- The fulcrum is located at one end of the lever.
- The resistance is situated between the fulcrum and the force.
- The fulcrum is positioned between the resistance and the effort. (correct)
Which type of force is characterized by the body being at rest?
Which type of force is characterized by the body being at rest?
- Dynamic Force
- Kinetic Force
- Static Force (correct)
- Frictional Force
For a body to be in equilibrium, what condition must be met?
For a body to be in equilibrium, what condition must be met?
- There is no net force acting on it. (correct)
- There must be a net upward force.
- The body must be in motion.
- The forces acting must be equal in magnitude.
In the context of levers, what does the effort arm refer to?
In the context of levers, what does the effort arm refer to?
Which of the following statements is true regarding static forces?
Which of the following statements is true regarding static forces?
What role does the fulcrum play in a lever system?
What role does the fulcrum play in a lever system?
Which equation correctly shows the relationship between force and resistance in levers?
Which equation correctly shows the relationship between force and resistance in levers?
What type of lever is exemplified by the human elbow during lifting?
What type of lever is exemplified by the human elbow during lifting?
Which statement accurately describes a first-class lever?
Which statement accurately describes a first-class lever?
What is a typical example of a second-class lever in the human body?
What is a typical example of a second-class lever in the human body?
Which lever type is described by the effort being closer to the fulcrum than the load?
Which lever type is described by the effort being closer to the fulcrum than the load?
How does the torque equation for levers in the human body balance?
How does the torque equation for levers in the human body balance?
Which of the following statements is true regarding third-class levers?
Which of the following statements is true regarding third-class levers?
What is an essential characteristic of a second-class lever?
What is an essential characteristic of a second-class lever?
Which of the following represents an accurate example of a first-class lever in the human body?
Which of the following represents an accurate example of a first-class lever in the human body?
What role does the Achilles tendon play in the context of lever systems in the body?
What role does the Achilles tendon play in the context of lever systems in the body?
Flashcards
Statics (in Physics)
Statics (in Physics)
The study of bodies and structures that are in equilibrium. For a body to be in equilibrium, there must be no net force acting on it.
Lever
Lever
A rigid bar that rotates around a fixed point or a fulcrum. Used to amplify force or movement.
Load
Load
The weight or resistance that is being moved by the lever.
Effort
Effort
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Effort Arm
Effort Arm
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Resistance Arm
Resistance Arm
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First Class Lever
First Class Lever
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Second Class Lever
Second Class Lever
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Third Class Lever
Third Class Lever
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Third Class Lever in Human Body
Third Class Lever in Human Body
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The Head as a First Class Lever
The Head as a First Class Lever
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Seated Dumbbell Triceps Extension
Seated Dumbbell Triceps Extension
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Standing on Tiptoes
Standing on Tiptoes
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The Elbow Joint
The Elbow Joint
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Study Notes
Statics Within the Body
- Statics is the study of forces on bodies at rest, focusing on equilibrium conditions.
- A body is in equilibrium when there's no net force acting on it.
- Forces in the body can be categorized as static, dynamic, and frictional.
Types of Levers
- Levers are rigid bars that rotate around a fixed point called a fulcrum.
- Three main types of levers exist: first-class, second-class, and third-class.
- First-class levers: The fulcrum is located between the load (resistance) and the force (effort). Examples are seesaws and scissors.
- Load and force can be in the same or different directions
- Second-class levers: The load is situated between the fulcrum and the force. Examples include standing on your tiptoes.
- Load is closer to the fulcrum
- Third-class levers: The force is positioned between the fulcrum and the load. Examples are in the elbow joint during weight lifting.
- Force is closer to the fulcrum
Examples of Levers in the Human Body
- First-class lever: Head balanced atop spine; seated dumbbell triceps extension.
- Second-class lever: Standing on the toes.
- Third-class lever: Elbow joint when lifting a book.
Torque and Levers
- Torque is the rotational equivalent of force.
- The total torque acting on an object in equilibrium is zero.
- Torque (of a force) = Force × Distance from fulcrum, or M × dM = W × dW
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