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Questions and Answers
What is the first fundamental force mentioned in the lecture?
What is the first fundamental force mentioned in the lecture?
What is the second fundamental force mentioned in the lecture?
What is the second fundamental force mentioned in the lecture?
How many fundamental forces are mentioned in the lecture?
How many fundamental forces are mentioned in the lecture?
What is the third fundamental force mentioned in the lecture?
What is the third fundamental force mentioned in the lecture?
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What is not a fundamental force mentioned in the lecture?
What is not a fundamental force mentioned in the lecture?
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In a third-class lever, where is the force located in relation to the fulcrum and load?
In a third-class lever, where is the force located in relation to the fulcrum and load?
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What is the function of the biceps muscle in the elbow joint example?
What is the function of the biceps muscle in the elbow joint example?
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What type of lever is the elbow joint an example of?
What type of lever is the elbow joint an example of?
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What is the name of the muscle mentioned in the elbow joint example?
What is the name of the muscle mentioned in the elbow joint example?
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What is the load in the elbow joint example?
What is the load in the elbow joint example?
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What is the approximate ratio of the electrical force to the gravitational force between an electron and a proton in a hydrogen atom?
What is the approximate ratio of the electrical force to the gravitational force between an electron and a proton in a hydrogen atom?
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Which of the following is an example of electrical force?
Which of the following is an example of electrical force?
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What is true about the electrical force between an electron and a proton in a hydrogen atom?
What is true about the electrical force between an electron and a proton in a hydrogen atom?
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Which of the following particles is involved in the electrical force in a hydrogen atom?
Which of the following particles is involved in the electrical force in a hydrogen atom?
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What is the direction of the electrical force between an electron and a proton in a hydrogen atom?
What is the direction of the electrical force between an electron and a proton in a hydrogen atom?
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What is the unit of acceleration due to gravity?
What is the unit of acceleration due to gravity?
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What is the force that causes our weight?
What is the force that causes our weight?
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What is a medical effect of gravitational force?
What is a medical effect of gravitational force?
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What is the direction of the venous blood flow in the legs?
What is the direction of the venous blood flow in the legs?
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What is the unit of force in the given formula: f = mg?
What is the unit of force in the given formula: f = mg?
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What is the direction of the force labelled N?
What is the direction of the force labelled N?
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What type of force is responsible for the horizontal reaction component FH?
What type of force is responsible for the horizontal reaction component FH?
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What is the relationship between the force N and the surface?
What is the relationship between the force N and the surface?
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What is the role of the surface in providing the force N?
What is the role of the surface in providing the force N?
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Study Notes
Fundamental Forces
- There are three fundamental forces: gravitational force, electrical force, and a third force (not specified).
Gravitational Force
- Gravitational force is the attraction between two objects with mass.
- It is denoted by F = mg, where m is the mass and g is the acceleration due to gravity (cm/sec2 or m/sec2).
- Example: Our weight is due to the attraction between the Earth and our bodies.
- Medical effects of gravitational force include:
- Formation of varicose veins in the legs as venous blood travels against gravity to the heart.
Electrical Force
- Electrical force is the force between electrically charged particles.
- Example: The electrical force between an electron (ē) and proton (p+) in a hydrogen atom is about 1039 times greater than the gravitational force between them.
Forces in the Body
Levers in the Body
- A third-class lever is a type of lever where the force is between the fulcrum and load.
- Example: The elbow joint is a third-class lever in the human body.
- When lifting a book, the elbow joint is the fulcrum across which the biceps muscle performs the work.
- The vertical reaction force (N) is supplied by the surface, and the horizontal reaction component (FH) must be supplied by frictional force.
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Description
This quiz covers the fundamental forces, including gravitational and electrical forces, and their effects on the body.
