Stress and Strain

What is stress in engineering terms?

• The weight of items pressing down on your hand and arm

• The force applied to an object per unit area

• The deformation of an object under the influence of stress

• The elongation of a material under stress

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-3

How is stress distributed in a bridge supporting the weight of passing cars?

• Evenly across its surface

• Only on one side of the bridge

• At the center of the bridge

• On the edges of the bridge

Tags

NGSS.MS-PS2-1

What is strain in engineering?

• The force applied to an object per unit area

• The deformation of an object under the influence of stress

• The elongation of a material under stress

• The weight of items pressing down on your hand and arm

Tags

NGSS.MS-PS2-2

What is the typical outcome when a material is subjected to stress beyond its elastic limit?

• It returns to its original shape.

• It undergoes plastic deformation.

• It becomes more elastic.

• It becomes more brittle.

In a tensile test, what is the point called where the material starts to deform plastically?

• Elastic Limit

• Yield Point

• Fracture Point

• Ultimate Strength

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

• Pascal (Pa)

• Newton (N)

• Joule (J)

• Watt (W)

What is the typical unit for strain?

• Metre (m)

• Newton (N)

• Dimensionless

• Pascal (Pa)

What is the formula for Young's Modulus?

What is the strategic importance of understanding stress in materials when designing a bridge?

• To ensure the bridge is colorful.

• To calculate the cost of materials.

• To prevent the bridge from collapsing under load.

• To make the bridge lightweight.

Tags

DOK Level 3: Strategic Thinking

What is the term for the maximum stress a material can withstand before it breaks?

• Yield Strength

• Ultimate Strength

• Elastic Limit

• Fracture Point