Introduction: Stress and Strain

What is stress?

• The change in the shape of an object

• The energy stored in an object

• The force experienced by the object that causes a change

• The amount of heat in an object

What is strain?

• The force applied to an object

• The weight of the object

• The change in mass due to temperature

• 
  The change in the shape of an object when stress is applied

Which of the following causes strain?

• Friction

• Pressure

• Stress

• Gravity

What happens to an object when stress is applied?

• It disappears

• It changes its shape

• It gains weight

• It loses energy

What happens when a material is loaded with a force?

• It cools down

• It produces stress

• It disappears

• t becomes weightless

What does a tensile force do to a material?

• Increases its weight

• Makes the body shorter

• Bends the material

• Makes the body longer

What is the effect of a compression force on a material?

• Makes the body longer

• Makes the body shorter

• Increases its temperature

• Breaks the material immediately

Which of the following is the correct cause-effect relationship?

• Material → Force → Stress → Deformation

• Deformation → Force → Material → Stress

• Force → Deformation → Stress → Material

• Stress → Material → Force → Deformation

What is the formula for stress?

• Stress = Force × Area

• Stress = Area / Force

• Stress = Force / Area

• Stress = Force × Length

What is the SI unit for stress?

• Newton (N)

• Pascal (Pa)

• Meter (m)

• Newton per meter