The formula for knowing stress is:

The Correct answer is Force / Area.

Key Points

• Stress is defined as the internal force per unit area that resists a change in shape or size of a body.
• The formula for calculating stress is Force / Area. This is denoted as σ = F / A.
• Units of stress are typically Pascals (Pa) in the International System of Units (SI).
• Stress is a measure of the intensity of the internal forces acting within a deformable body.
• Stress can be categorized into different types such as tensile stress, compressive stress, and shear stress.
• Understanding stress is crucial in fields like mechanical engineering, civil engineering, and material science to ensure structural integrity.

 Additional Information

• Force / Mass
  • This formula is incorrect for stress but is relevant for calculating acceleration using Newton's second law of motion (F = ma).
• Mass / Area
  • This formula is not related to stress but rather to surface density or area density, which measures the amount of mass per unit area.
• Force / Time
  • This formula is unrelated to stress. It could relate to the concept of impulse in physics, defined as the change in momentum over time.