Springs

Question 1

State Hooke’s law.

Answer 1

The extension is proportional to the force applied provided the limit of proportionality is not exceeded. F=kx where F is the force applied in Newtons, k is the force constant dependent on the material being stressed in Nm^-1 and x is the extension in metres

Question 2

Define Elastic Deformation.

Answer 2

A reversible change in the shape of an object due to a compressive or tensile force; removal of stress or force will return the object to its original shape.

Question 3

Define Plastic Deformation.

Answer 3

An irreversible 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.

Question 4

Define Force constant.

Answer 4

The amount of force required to produce an extension of one metre (when using S.I units).

Question 5

Define Extension.

Answer 5

The difference between the length when under load and the original length.