Moment & co

What is Hooke's law?

• F = ke

  Force = spring constant × extension

• F = ma

  Force = mass × acceleration

What is another name for the spring constant k? (Select all that apply)

• Force constant

• Mass constant

• Stiffness

• Extension

What is the SI unit of k?

• N

• N/m

• Nm

What is tension?

• Force in a stretched spring or rope/wire

• Force of upthrust

What is the tension in the spring? Hint: it's equal to the weight of the object attached

• 2 N

• 2 kg

• 20 N

What is elastic potential energy?

• Energy stored at a height

• Energy stored in a stretched spring or material

How do you calculate elastic potential energy or work done by a spring? (Select all that apply)

• W = ½Fe

• W = ½ke²

• W = mgh

What two things can you calculate from this graph?

• gradient = k

• perimeter = acceleration

• area under the graph = elastic potential energy or work done

How is tensile stress calculated?

• Stress σ = force(F) ÷ cross-sectional area(A)

• Stress σ = force(F) × cross-sectional area(A)

How is tensile strain calculated?

• Strain ε = extension (e) ÷ original length (L)

• Strain ε = extension (e) × original length (L)