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WorksheetsMoment & co
Total questions: 20
Worksheet time: 40mins
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)
What is the SI unit of tensile stress?
N/m²
N
Nm
What is the SI unit of tensile strain?
No unit
N
A spring of length 12 cm was stretched to 18 cm by a weight. What is the extension produced?
18 cm
6 cm
30 cm
A spring of original length of 7 cm was stretched by 3 cm. What is the new length of the spring?
3 cm
10 cm
4 cm
What is the equation for the Young's modulus? (Select all that apply)
Young's modulus (E) = stress ÷ strain
Young's modulus (E) = stress × strain
Young's modulus (E) = FL ÷ Ae
Young's modulus (E) = F/A ÷ e/L
How do you find the Young's modulus from this stress vs strain graph?
Area under the graph
Gradient of the linear portion
What is this point called?
Proportionality limit
Force limit
What is elastic limit?
The minimum stress applied on an elastic material beyond which a permanent deformation occurs.
The minimum force applied on an elastic material beyond which a permanent deformation occurs
What is yield point?
The point on a stress-strain graph beyond which an elastic material becomes plastic.
The point on a force-extension graph beyond which an elastic material becomes plastic.
What is strain?
The relative change in the size of an object due to applied forces.
The relative density of an object.
