6.1 + 6.2 Springs and Hooke's Law & Elastic Potential Energy Flashcards
what are tensile forces?
forces that act away from the centre of the string in both directions and will cause it to extend and stretch out
result= tensile deformation
what are compressive forces?
forces acting towards the string in both direction
result= compressive deformation
What is Hookes law?
the force applied is directly proprtional to the extension, untill the limit of proportionality has been exceeded
how do you determine the spring constant of a wire?
F=ek
what is elastic deformation?
a change in the shape of a material that is reversible. Removal of the tensile/ compressive strength will return the material to it’s original shape and size
which letter is the elastic limit?
- The light blue dot is the elastic limit , beyond which the graph is no longer straight.
- Not the green dot, should the force be removed, the material will follow the light blue line to a size that’s not equal to the original size.
what is plastic deformation?
A plastic deformation is a change in the shape of a material that is irreversible. Removal of a tensile or compressive force (or stress) will return the material to a different shape and size.
where does plastic deformation start to occur?
Plastic deformation starts to occur after the elastic limit has been exceeded (after the blue dot)
define stiffness
the extent to which an object deforms under stress
what is the equations for elastic potential energy?
What is the total spring constant for springs in parallel?
what is the total spring constant for springs in series?
what is the force constant?
The amount of force required to produce an extension of one metre (when using SI units)
