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# PLTW POE L 2-1

### Honors PLTW Principles of Enginering Level 2-1 Statics

Vocab Word | Definition |
---|---|

Cable | A strong rope designed to be used in structures |

Centroid | Geometric Area Center |

Compression Force | Body subjected to a push |

Concurrent Force Systems | Force system where all forces are applied at the common point on the body or having lines of action with a common intersection point |

Cross-Sectional Area | Surface or shape thats exposed by making a straight cut through something at right angles to the axis |

Direction of a Vector | Defined by the angles between the reference axis and the arrow's line of direction |

Fixed Support | Support that prevents translation and beam rotation |

Flange | Broad ridge or pairs of ridges projecting at a right angle from its environment, showing external forces acting upon it |

Free Body Diagram | Used to isolate a body from its environment, showing external forces acting upon it |

Gusset | Plate or bracket for strengthening an angle in framework |

Joint | Connection points of members of a truss |

Magnitude | Absolute value of a number |

Member | Slender straight pieces of a truss connected by joints |

Method of Joints | Method of analysis of trusses which constructs free body diagrams of each joint and determines the forces acting in that joint considering equilibrium of the joint pin |

Moment | Turing effect of force about a point equal to the magnitude of the force times the perpendicular distance from the point to the line of action from the force |

Moment of Inertia | Mathematical property of cross sections that is concerned with surface areas and how areas are distributed about a centroidal axis |

Newtons 1st | Inertia: Things keep doing whatever they all ready are doing. |

Newton's 2nd | Particles continue at a state of rest |

Newton's 3rd | If bodies exert a force on another then the 2nd body exerts force on the 1st body |

Pinned Support | Support that prevents translation |

Planar Truss | Lies in a single plane often to support roofs and bridges |

Resultant Force | Resultant of a system of force is the vector sum of all forces |

Roller Supports | Support that prevents beams from translating in 1 direction |

Scalar | Physical quantity that has magnitude only |

Sense | Sense of a vector is the direction of the vector relative to its path and indicated by the location of the arrow. |

Simple Truss | Composed of triangles, which will retain its shape even when removed from supports |

Static Equilibrium | Condition where there are no net external forces acting upon a particle or rigid body and the body remains at rest or continues at a constant velocity |

Statically Indeterminate | Structure or body which is over-constrained such that there are more unknown supports than there are equations of static equilibrium |

Structure | Something made up of interdependent parts in a definite pattern of organization, like trusses, machines and frames |

Tension Force | Body subjected to a pull |

Vector Quantity | Quantity that has both magnitude and direction |