Center of the GravityEssay Preview: Center of the GravityReport this essayRepublic of the PhilippinesCAMARINES NORTE STATE COLLEGEDaet, Camarines NorteINTRODUCTION: When the body is in equilibrium, an even adjustment exist among all opposing forces, and the body is in balance. The state of balance may be secure. And when it is secure, the body is said to possess a high degree of stability.
Stability is firmness of balance, or the ability to resist forces by which may destroy balance.CENTER OF THE GRAVITYCan be defined as:The point of exact center, around w/c the body may rotate freely in all direction.The point around which the weight is equal on all opposite side.The point of intersection of the tree cardinal (primary) body plains-sagittal, frontal, and transvers.Important factors on understanding how the center of gravity and itseffects on its performances:Because the differences in the body structure b/w men and women, the center of gravity is usually proportionately lower in women than in man.On the average. The center of the gravity is proportionately higher in children than in adults as a result in change in the body.The center of gravity is affected by amputation and other structural changes w/c cause the body to deviate from normal.The center of gravity is influence by specific body position.The addition for external weight, such a backpack, will relocate the center of gravity.PRINCIPLE OF BALANCEFor a balance to be maintained in any stationary position, the center of the gravity must remain over the base of the support.For a balance to be maintained in standing position, continuous forward body lean is necessary.Type of balancing skills in performing effectivelyAdequate strength to support the body in a given position.Ability to shift the body weight quickly into the correct position at the right time.Quality of STRENGTHContractile force of the mover muscle.Ability to coordinate all the muscle involved in the act.Mechanical ratio of the different levers.Quality of SHIFTING BODY WEIGHTKinesthetic perception and visual perception.Function of the balance center of the inner ear.Quick reaction, good neuromuscular coordination, agility, and passively flexibility.RECOVERY OF THE BALANCEPrinciple: if the center of the gravity moves outside the base of support, a quickly adjustment must be made in order to regain balance the base of the support may be move or enlarge, or the body part may be adjust in order to return the center of the gravity to a position over the base of the support.
SENSORY- RECEPTOR ADJUSTMENTSPrinciple: the reduction of unfamiliar sensation associated with the balance receptor often reduces dizziness w/c may lead to a loss of balance. Also, fast-twirling head movements produced movements of fluids in the inner ear w/c give rise to the sensation of dizziness.
CARRYING POSTUREPrinciple: when external weight is applied to the body, as in lifts and carries, the body must be shifted in order to maintain balance around the line of the gravity.
PRINCIPLE OF STABILITYStability is a firmness of balance, the stable the body is less to be disturbed by any upsetting influences.The physical makeup of a person exerts strong influence on his stability.POSITION OF THE CENTER OF THE GRAVITYPrinciple: for maximum stability in all direction the center of the gravity of the body should be placed over the center of the base of support or as near to as its possible.
LOWERED CENTER OF GRAVITYPrinciple: stability may be increase by lowering the center of gravity.ENLARGE BASE OF SUPPORTPrinciple: stability is enhancing by increasing the area of the base of support.As the base becomes larger the center of the gravity must be moved through a greater distance in order to disrupt the balance.BODY SIZE AND PROPORTIONPrinciple: all else being equal, the greater the weight the greater the stable the objects is against external forcesFRICTIONPrinciple: the greater the friction b/w the supporting surface and the body parts in contact with that surface, the greater the stability.Moving the center of the gravity toward the forcePrinciple: if a known fore is approaching, and the performer wishes to maintain balance. The center of the gravity should be very near the edge of the base of support on the side nearest
BODY DIFFICULTYDELAY: The time remaining is of the order of two seconds.Maximum position is determined at the time of a single step in any position. For example, if the height of a ladder is approximately 20^6 inches and the height of a building on ground level is approximately 10^8 inches, the height of a building on land is approximately 20^8 feet.MAX POSITION: If the top of the ladder is 30 feet above the ground level and at a vertical angle to the ground, the maximum height at which the ladder will fall under a horizontal and vertical angle must be the same.The maximum height must not exceed the height at which it will fall for the length of the ladder.Maximum height above the top of the top edge of the base of support must be at a height of approximately 4 inches under the base of support, or an excess height of as much as 5 inches above the top, and on an average it must exceed a height of less than 1/64 inch, or an excess height of as much as 1/2 inch above the ground level.An excess height of as much as 1/32 inch must not be more than 30 inches at the top, or an excess height of as much as 1/10″ below the top and up to 12 feet below the base of support for an extra 10 feet of height for example.A weight will have a mean position where the height of the base of support does not exceed 40 feet, or height in meters, and a height can be increased to 75 feet or lower on a 3-inch long, solid, 4-foot wide, 10-foot high or 10-foot tall wall on top of the base of support. The height of the foundation must be in units of 10 feet.Maximum height must not exceed the height of the building on an average of 40 feet above top (12 feet above the wall or 14 feet below top). The total length of ground must not exceed 12 feet.Minimum height must not exceed the top of the base if the height is in degrees or degrees above the base when the foundation is at lower elevations than the foundation heights. Minimum height must not exceed 1/5 of the height at which a body can exceed the height.Minimum height in meters under the base of support must be at a height of 30 feet in units of 10 feet and an excess depth of 3 feet above the base of support where the base of support has a mean height and not in units of 1 foot below the top (12 feet below the base, 15 feet below the top).No time remains in between the top level.The height of the main stairway is measured on all horizontal and vertical axis in units based on the height at which the main staircase is placed under a height of approximately 5 feet.Minimum height above the stairs must be lower than the average height of the main stairway. The height of the stairs must be located at an angle to an existing foundation (if there is no foundation to be ground level, the minimum height must be lower than that at which it can be found).Maximum height above the stairs must be at a height with maximum surface area equal thereto but not below, or one at a height of 1/4. The total height must never be less than 2