15. Center of Gravity Flashcards
What’s the best way to walk a tightrope?
Using a long pole will increase rotational inertia by increasing both mass and distribution
A curved pole lowers the position of the centre of gravity, therefore increasing stability
Compared to opposite happening when you put your arms up
What is the The Center of Gravity?
The center of gravity is the point on a system around which its weight is evenly distributed or balanced
The center of gravity is the point through which the force of gravity acts
Imagine a ruler stacked with 6 quarters. If the quarters were were all stacked in the middle or if 3 were placed on either end, the center of gravity would be in the middle of the ruler. If the quarters were all placed on one side, the position center of gravity would shift towards the heavier end.
When standing upright with both feet on the ground, the center of gravity is positioned in the middle of the body.
What would happen if you were to lean to one side?
When an individual leans to the side, the position of the center of gravity shifts to the side where the weight is concentrated
How is the center of gravity influenced by height?
The vertical position of the center of gravity is influenced by the distribution of forces (mass)
As weight is added on top of the system the center of gravity will shift upwards towards the added force (heavier end)
Where is the center of gravity usually located on a person?
The position of the center of gravity is located at approximately 55% of your standing height
Which ways can The position of the center of gravity shift?
What is rectilinear motion?
A force acting through the center of gravity produces rectilinear motion
What is curvilinear motion?
A force acting off the center of gravity produces curvilinear motion
What is a Couple?
Two forces, equal in magnitude, acting off the center of gravity in opposite directions causing only translation (pure moment)
