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14 Cards in this Set
- Front
- Back
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Backward stability |
The measure of crane steadiness in relation to the tipping axis on the opposite side of the crane from the boom |
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Center of gravity |
The point where one can assume all of an object's mass, and therefore it's weight is concentrated. |
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Combined center of grabity |
The sum of the crane's and load's COG at a position along an imaginary line connecting the two |
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Dynamics |
The response of objects to the application forces, moments, or torques |
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Forward stability |
The measure of the crane's steadiness in relation to the tipping axis on the same side as the boom |
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Impact loading |
Sudden forces acting on an object due to collisions or other dynamic events |
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Momentum |
A property of a moving object that is directly proportional to both its mass and speed |
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Non-centered lift |
Any lift that is attempted when the hoist line is not vertical or the hook is not directly above the load's center of gravity |
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Pendulum effect |
The dynamic effects of a swinging object on the support from which it is suspended |
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Chicago boom |
A load-hoisting device consisting of a single boom attached at its base to either a vertical post or beam in a larger structure, such as a building |
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Coefficient of friction |
A ratio that expresses a comparison between the force necessary to move an object over the surface of another material, and the pressure between the two materials |
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Cribbing |
A stack of squared timbers laid in a crisscross pattern to temporarily support loads during movement and placement |
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Inclined plane |
Flat surfaces placed at a shallow angle that connect levels at different heights (ramp) |
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Moment |
Product of a force acting perpendicularly to an arm of some length attached to a point around which it rotates M=D*Fperp D- distance between the position where the force acts and the pivot point Fperp- force applied tonperpendicular arm |
