24 Questions
What is the first fundamental force mentioned in the lecture?
Gravitational force
What is the second fundamental force mentioned in the lecture?
Electrical force
How many fundamental forces are mentioned in the lecture?
3
What is the third fundamental force mentioned in the lecture?
None of the above (it's not mentioned)
What is not a fundamental force mentioned in the lecture?
Magnetic force
In a third-class lever, where is the force located in relation to the fulcrum and load?
Between the load and the fulcrum
What is the function of the biceps muscle in the elbow joint example?
It performs the work
What type of lever is the elbow joint an example of?
Third-class lever
What is the name of the muscle mentioned in the elbow joint example?
Biceps muscle
What is the load in the elbow joint example?
The book
What is the approximate ratio of the electrical force to the gravitational force between an electron and a proton in a hydrogen atom?
1039 times greater
Which of the following is an example of electrical force?
The 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?
It is stronger than the gravitational force
Which of the following particles is involved in the electrical force in a hydrogen atom?
Electron and proton
What is the direction of the electrical force between an electron and a proton in a hydrogen atom?
Attractive
What is the unit of acceleration due to gravity?
cm/sec2
What is the force that causes our weight?
Gravitational force
What is a medical effect of gravitational force?
Formation of varicose veins
What is the direction of the venous blood flow in the legs?
Against the force of gravity
What is the unit of force in the given formula: f = mg?
Newton
What is the direction of the force labelled N?
Perpendicular to the surface
What type of force is responsible for the horizontal reaction component FH?
Frictional force
What is the relationship between the force N and the surface?
The force N is supplied by the surface
What is the role of the surface in providing the force N?
It supplies the force N
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.
This quiz covers the fundamental forces, including gravitational and electrical forces, and their effects on the body.
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