Category 1: Stress & Strain
What is Youngs modulus defined as?
Stress / Strain
On a stress-strain graph, what does the gradient represent?
Young modulus
Where is strain energy stored in a bow before releasing an arrow?
In the bent limbs of the bow
What happens to a material beyond its elastic limit?
It deforms permanently (plastic deformation)
On a stress-strain graph, what does the area under the curve represent?
Strain energy density
Why do crash barriers on highways deform during impact?
To absorb energy and protect passengers
Name one material with a very high Young modulus.
Steel (or diamond)
Identify the point where a material stops obeying Hooke's law.
Limit of proportionality
How does the Burj Khalifa handle strong desert winds?
It sways slightly, storing strain energy elastically
Write the formula for strain energy.
1/2 Fx
Which region of the curve represents elastic behavior?
The initial linear region
Why are springs preferred in vehicle suspensions?
They store and release strain energy, absorbing shocks