Stress and Strain Concepts

This video tutorial introduces the concepts of stress, strain, and Young's modulus in engineering. It explains stress as the force per unit area, with examples of compressive and tensile forces affecting beam length. Strain is defined as the change in length per unit length, and Young's modulus is the ratio of stress to strain. The video also covers direct stress types, including compressive and tensile stress, and introduces shear stress, highlighting its association with sliding motion and providing calculation methods for different scenarios.

What is the unit of stress in the International System of Units (SI)?

• Newton

• Watt

• Pascal

• Joule

Which type of force attempts to compress a beam?

• Compressive force

• Shear force

• Bending force

• Tensile force

How is strain defined in terms of length?

• Change in length divided by original length

• Original length divided by change in length

• Force divided by area

• Area divided by force

What is Young's Modulus a measure of?

• The ratio of mass to volume

• The ratio of length to breadth

• The ratio of force to area

• The ratio of stress to strain

What is direct stress caused by?

• A force applied parallel to the surface

• A force applied directly to the cross-sectional area

• A force applied at an angle

• A force applied in a circular motion

Which type of stress is associated with sliding motion?

• Shear stress

• Compressive stress

• Direct stress

• Tensile stress

In shear stress, what is the area used in the calculation when two plates are joined by a nail?

• Diameter times thickness

• Pi divided by 4 times diameter squared

• Force divided by area

• Length times breadth

What happens to an object under shear stress if the applied forces are strong enough?

• It rotates

• It stretches

• It compresses

• It slides

When calculating shear stress for a drilled hole, what is the formula for the area?

• Length times breadth

• Pi times diameter times thickness

• Diameter squared

• Force divided by area

What does the Young's Modulus of shear stress represent?

• The ratio of direct stress to direct strain

• The ratio of compressive stress to compressive strain

• The ratio of tensile stress to tensile strain

• The ratio of shear stress to shear strain