Stress, Strain, and Elastic Modulus

What is stress in terms of physics?

• Stress is the speed of an object in motion.

• Stress is the temperature of a material.

• Stress in terms of physics is the force per unit area applied to a material.

• Stress is the color of light emitted by an object.

Define strain and its formula.

• Strain = (Change in volume) / (Original volume)

• Strain = (Change in area) / (Original area)

• Strain = (Change in length) / (Original length)

• Strain = (Change in time) / (Original time)

How is the elastic modulus defined?

• Measure of a material's ability to deform and return to its original shape

• Ratio of material's density to its volume

• Unit of measurement for material flexibility

• Measure of a material's ability to stretch indefinitely

What is the relationship between stress and strain?

• The relationship between stress and strain is influenced by the material's taste

• The relationship between stress and strain is determined by the color of the material

• The relationship between stress and strain is described by the material's modulus of elasticity, also known as Young's modulus.

• Stress and strain are related through the material's temperature

Explain the difference between tensile stress and compressive stress.

• Tensile stress causes materials to contract, while compressive stress causes expansion.

• Tensile stress stretches materials apart, while compressive stress squeezes materials together.

• Tensile stress pushes materials together, while compressive stress pulls them apart.

• Tensile stress has no effect on materials, while compressive stress deforms them.

Calculate the strain when a material experiences a stress of 100 MPa and has a Young's modulus of 200 GPa.

• 0.0003

• 0.0005

• 0.0008

• 0.001

What is the unit of measurement for the elastic modulus?

• Meters (m)

• Kilograms (kg)

• Watts (W)

• Pascals (Pa) or Newtons per square meter (N/m^2)

• Joules (J)

Describe the behavior of a material under elastic deformation.

• The material returns to its original shape once the deforming force is removed.

• The material permanently changes shape under elastic deformation.

• The material becomes more rigid under elastic deformation.

• The material becomes magnetic under elastic deformation.

What happens to a material when it reaches its elastic limit?

• It becomes more flexible.

• It becomes stronger.

• It returns to its original shape.

• It undergoes permanent deformation.

How does the elastic modulus relate to the stiffness of a material?

• The elastic modulus has no impact on the stiffness of a material

• The elastic modulus is inversely related to the stiffness of a material

• The elastic modulus directly relates to the stiffness of a material, with a higher elastic modulus indicating a stiffer material.

• The elastic modulus is only related to the density of a material