Materials Flashcards
What is a tensile force?
A force which causes something to stretch or extend. (Tension —> Tensile)
What is Hooke’s law?
F = k x Δl OR The extension is proportional to the force applied provided the limit of proportionality is not extended.
What is the spring constant?
The constant in a spring that determines how stiff it will be.
What is the units for the spring constant?
Nm⁻¹
When springs are in parallel, how do we calculate the total spring constant?
Kₜ = K₁ + K₂
When springs are in parallel, how is weight distributed?
Weight is shared to the springs.
When springs are in series, how do we calculate the total spring constant?
1/Kₜ = 1/K₁ + 1/K₂
How does extension differ from springs in series to springs in parallel?
Springs in series will increase in extension whilst springs in parallel will decrease in extension.
How do we calculate elastic potential energy in springs?
½F x Δl = Eₚ OR ½k x Δl²
How do we calculate stress?
σ = F / A
What is stress?
A way to measure a force that causes an object to deform.
How do we calculate strain?
ε = Δl / l
What is strain?
The extension of something relative to it’s original lengh.
How do we calculate Young’s Modulus?
E = Stress (σ) / Strain (ε) =
What are the units for Young’s Modulus?
Nm⁻¹ OR Pa
