Types of stresses that affect beams. The arrows show the direction of force.

Types of stresses that affect beams. The arrows show the direction of force.

ZIMSEC O Level Combined Science Notes: Stress in beams

  • If a material (beam) is subjected to a force, an equal force acts in the opposite direction
  • This force is known as reaction
  • This results in forces being set up inside the material(beam)
Forces and reaction. i) A load resting on the ground. ii)A balanced lever

Forces and reaction. i) A load resting on the ground. ii)A balanced lever

  • These internal forces are known as stresses
  • stress-forces that occur inside a material as a result of forces acting within it
  • There are three types of stress
  • Tensile stresses-is a result of stretching forces.
  • They are created by forces trying to pull the material apart
  • compressive stresses-are a result of forces acting in opposite direction with one another creating a squashing effect.
  • They are produced by forces trying to compress material
  • shear stresses- these are also known as twisting forces
  • they are produced by equal and opposite forces which are not in line.
  • They tend to make one part of the material slide over one another.

Load and shape

  • when a load is applied to a material
  • Stresses are produced
  • Most times there is also a change of shape especially if the material is not rigid

To access more topics go to the Combined Science Notes page.

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