Learning Goal: Part A - Calculating the moment about O using the scalar method To demonstrate the consistency of the principle of moments by calculating a moment using the scalar and vector methods and comparing the results. In two dimensions, the moment ot a force can be calculated using the scalar method, Mg = Pd, where Pis the mag distance from the line of force to the point where the mornent is being considered. Using the stalar method, calculale As shown, a curved member is fixod al poinl O. The radius uf the mermber is r= 3.15 ft and F has magnitude F = 100 lb.(Figure 1) Express your answer to three significant figures and include the appropriate units. • View Available Hint(s) HA ? Mọ = Value Units k Submit Figure < 1 of 2 Part B - Calculating the moment about O due to the x component of F The torce vector F can be writen as the sum ot component vectors F = (F), + (F). We can use the scalar metne the moment from the components. (Figure 2What is the moment about O due to only the x component of F? Express your answer to three significant figures and include the appropriate units. • View Available Hint(s) ? 45° (Mo) - E.d. Value TInits
Plane Trusses
It is defined as, two or more elements like beams or any two or more force members, which when assembled together, behaves like a complete structure or as a single structure. They generally consist of two force member which means any component structure where the force is applied only at two points. The point of contact of joints of truss are known as nodes. They are generally made up of triangular patterns. Nodes are the points where all the external forces and the reactionary forces due to them act and shows whether the force is tensile or compressive. There are various characteristics of trusses and are characterized as Simple truss, planar truss or the Space Frame truss.
Equilibrium Equations
If a body is said to be at rest or moving with a uniform velocity, the body is in equilibrium condition. This means that all the forces are balanced in the body. It can be understood with the help of Newton's first law of motion which states that the resultant force on a system is null, where the system remains to be at rest or moves at uniform motion. It is when the rate of the forward reaction is equal to the rate of the backward reaction.
Force Systems
When a body comes in interaction with other bodies, they exert various forces on each other. Any system is under the influence of some kind of force. For example, laptop kept on table exerts force on the table and table exerts equal force on it, hence the system is in balance or equilibrium. When two or more materials interact then more than one force act at a time, hence it is called as force systems.
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