Springs Flashcards
What doe Hooke’s law state?
That the extension is proportional to the force applied provided the limit of proportionality is not exceeded.
What doe the Force equal?
F=kx where k=spring constant (Nm^-1) and x=extension (m).
On a Force-extension graph, what does the gradient represent?
The spring constant
What is F directly proportional to?
x
What does the extension equal?
the final length of spring - the original length
What is the force constant like for a stiff spring?
The force constant is large.
The larger the force constant……..
the smaller the extension.
What is elastic deformation?
It is a change in the shape of a material that is irreversible.
What will return material to its original shape and size?
The removal of a tensile or compressive force.
What is stiffness?
The extent to which an object deforms under stress.
What happens when spring is stretched?
It will store energy
What does the area under a force extension graph equal?
The energy stored.
What is the equation for elastic potential energy? (2)
Ep=1/2Fx or Ep=1/2Kx^2.
What does work on a spring?
The force applied.
For two spring in parallel what is the equation?
KT = K1 + K2…..
For two spring in series what is the equation?
1/KT = 1/K1 +1/K2……
What is the gradient like for springs in series on a force-extension graph?
Less steap than normal.
Sketch the graph that looks like for springs in parralel and series on comparison to k?
Look at notes!
Define Hooke’s law.
The extension is proportional to the force applied provided the limit of proportionality is not exceeded.
Define Plastic Deformation.
A reversible change in the shape of an object due to a compressive or tensile force; removal of the stress or force will not return the object to its original shape
Define Plastic Deformation.
A reversible change in the shape of an object due to a compressive or tensile force; removal of the stress or force will not return the object to its original shape
What is the relationship between force and extension?
They are proportional but only in the opposite direction to the displacement.
