33 Structural Systems Bingo A change in shape of a material caused by compression or tension: Strain Forces that try to twist a material apart are called : Torsion The 5 types of forces are ____ tension, bending, shear, & torsion Compression Basic load measurements can be made by modeling or ____ testing. Empirical Snow evenly distributed on a rooftop is called a : UDL Using algebraic & trigonometric functions to study forces is Vector Analysis The trigonometric ratio for tangent is ______/ adjacent. Opposite Channels, plates, rods, & tubes are all types of : Beams Alexandre Eiffel was a French _____ engineer. Civil Bent material has a(n) ___ axis without compression or tension. Neutral This structural material is made from thin layers of glued wood. Plywood Combining the measures of ___ & strain is how stiff a material is Stress The formula for stress is force / _____. Area The formula for the area of a ____ is Pi * r^2. Circle This type of load is characterized by forces in motion. Dynamic When forces acting up from the chair=the downward force of weight Equilibrium Pi is equal to the _____ divided by the diameter of any circle. Circumference Strain is equal to the change in length divided by the ___ length Original The stiffness of a material is known as Young's ___ of elasticity Modulus This material is one of the stiffest materials known to man. Diamond Phase in between the plastic & the breaking point is ____ stage. Elastic Planning a product to fail after certain period of use is Planned Obsolescence Any product capable of last 3 years is considered Durable Compression in the US is often measured in : PSI Forces exerted are in the same plane but in opposite direction: Shear Structural Components that resist tension are called : Ties Vertical cables are used as ties in ______ bridges. Suspension The Sine relationship is opposite / _____. Hypotenuse Point loads are sometimes measured by ______ calculations. Moment Lines that describe both the direction & magnitude of a force: Vector The moment load calculation for turning a wrench would be Force * Distance Structural Components that resist compression are called: Struts Torque is often measured in which unit : Ft-lbs