Engineering

• beam


  a structural member that supports loads applied at various points along its length
• concurrent forces


  two or more forces who's lines of action intersect at the same point
• force system


  one or more forces acting simultaneously on an object or at a point
• moment 


  the measure of the capacity or ability of a force to produce twisting or turning effect about an axis

  the product of the force and the perpendicular distance (M=fxd)
• non concurrent forces


  two or more forces acting on the same object that do not meet at the same point
• torque


  the tendency of a force to rotate an object about an axis
• simply supported is a beam supported on the ends which are free to rotate
• overhanging is a simple beam extending beyond its support on one end
• cantilever is a projecting beam fixed only at one end
• continuous is a beam extending over more than two supports
• double overhanging is a simple beam with both ends extending beyond its supports
• fixed is a beam supported on both ends and restrained from rotation
• stress is the measurement that describes the interal forced of a material
• internally beams experience compressive, tension, and shear stress
• What is the fomular for moments 


  m=fXd
• what happens to when the top of the beam or bridge is reduced in length

  compression
• what happens when the bottom of the beam or bridge is streched 


  tension
• what is the name of the middle of the beam that experiences no change

  neutral axis
• what are the 2 types of stress a beam can experience

  tension, and compression
• static friction


  friction between 2 objects that are not moving
• kinetic frictions


  friction between 2 objects that are moving
• friction 


  a force that resists the sliding of one object over another
• what is the first characteristic of sliding friction

  it is nearly independent of the area in contact
• what is the second characteristic of sliding friction

  friction is prerational to the normal force that presses the surfaces together
• what is the first law of friction

  friction always acts in a direction opposite to impending or actual motion
• what is the second law of friction

  the value of the coefficient of static friction depends on the nature and condition of the surfaces in contact but is independent of the areas in contact
• what is the third law of friction

  in general, kinetic friction is less than static friction
• Fw 


  force weight ⬇️
• Ff 


  frictional force ⬅️
• Fn 


  normal force ⬆️
• Fp


  applied force ➡️
• the coefficient is the relationship between 2 surfaces and is a constant
• what is the mu formular

  mu=Ff/Fn
• what do you have to do to get weight to mass (convert Kg)

  times by 9.81