Podcast
Questions and Answers
Which statement accurately describes the Centre of Gravity (COG)?
Which statement accurately describes the Centre of Gravity (COG)?
- The COG remains the same regardless of the orientation of the object.
- The COG is a hypothetical point where all mass is considered to be concentrated. (correct)
- The COG shifts towards the heavier side when external mass is added. (correct)
- The COG is always at the physical center of an object.
What is a characteristic of static equilibrium?
What is a characteristic of static equilibrium?
- There is no movement, and all forces acting on the body are balanced. (correct)
- The COG must always be outside of the base of support.
- The body is in continuous motion but remains balanced.
- Only external forces need to be considered for balance.
Which factor does NOT affect the stability of an object?
Which factor does NOT affect the stability of an object?
- The height of the centre of gravity
- The color of the object (correct)
- The size of the base of support
- The weight of the object
When external mass is applied to one side of an object, how does it generally affect the COG?
When external mass is applied to one side of an object, how does it generally affect the COG?
What defines a dynamic equilibrium state?
What defines a dynamic equilibrium state?
What must occur for an object to maintain stability?
What must occur for an object to maintain stability?
How does increasing the mass of an object affect its stability?
How does increasing the mass of an object affect its stability?
Which condition will not enhance an object's stability?
Which condition will not enhance an object's stability?
What happens to the center of gravity (COG) when a person carries a heavy suitcase in one hand?
What happens to the center of gravity (COG) when a person carries a heavy suitcase in one hand?
What is the effect of adding external mass to a person standing on one leg?
What is the effect of adding external mass to a person standing on one leg?
How can a person effectively relocate their line of gravity during movement?
How can a person effectively relocate their line of gravity during movement?
Which of the following does NOT contribute to maintaining equilibrium in dynamic movements?
Which of the following does NOT contribute to maintaining equilibrium in dynamic movements?
What is the primary impact of a large base of support on the line of gravity?
What is the primary impact of a large base of support on the line of gravity?
What happens to the center of gravity (COG) of an object when it is asymmetrical?
What happens to the center of gravity (COG) of an object when it is asymmetrical?
How does the base of support (BOS) affect the stability of an object?
How does the base of support (BOS) affect the stability of an object?
Which statement is true regarding static and dynamic equilibrium?
Which statement is true regarding static and dynamic equilibrium?
What affects the location of the center of gravity (COG) in the human body?
What affects the location of the center of gravity (COG) in the human body?
When a person inclines their trunk forward, where does the COG shift?
When a person inclines their trunk forward, where does the COG shift?
Which factor contributes most significantly to the stability of an object?
Which factor contributes most significantly to the stability of an object?
What is described as the line running vertically from the center of gravity to the ground?
What is described as the line running vertically from the center of gravity to the ground?
Which condition most directly affects an object's equilibrium?
Which condition most directly affects an object's equilibrium?
Flashcards are hidden until you start studying
Study Notes
Center of Gravity (COG)
- The COG is the hypothetical point where all an object's mass is concentrated.
- It's the point where gravity appears to act.
- In symmetrical objects, the COG is located at the geometric center.
- In asymmetrical objects, the COG is located towards the heavier end.
- The COG in the human body is located differently for each body segment.
- The COG of the whole body can be found by combining the COG of each segment.
- The location of the COG in the human body changes with different postures.
- When the trunk is inclined forward, the new COG is located outside the body.
Line of Gravity (LOG)
- The LOG is a vertical line that passes through the COG and extends to the ground.
- It represents the direction of the force of gravity acting on the object or person.
- It can be visualized as a string with a weight on the end, attached to the COG.
Equilibrium
- Static equilibrium: A state where an object is at rest.
- Dynamic equilibrium: A state where an object is moving at a constant velocity.
- Equilibrium occurs when the forces acting on an object are balanced.
Rules of Equilibrium
- The larger the base of support (BOS), the more stable the object.
- The closer the COG to the BOS, the more stable the object.
- An object is not stable unless the LOG falls within the BOS.
- The greater the mass of the object, the greater the stability.
- The greater the friction between the supporting surface and the BOS, the more stable the object.
Relocation of Center of Gravity
- The COG of an object can change depending on the arrangement of segments and distribution of mass.
- Adding external mass to the body will shift the COG towards the added weight.
- This shift is proportional to the weight added.
Gravity
- An external force that acts on all objects.
- The force of gravity is the pull of the earth on a body or its segments.
- It's a constant force directed towards the center of the earth.
- Gravity as a force is a vector quantity.
- Point of application: COG
- Line of application: Center of mass of the object
- Direction: Towards the center of the earth
- Magnitude: Equal to gravitational force
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
