b) Young modulus

dii) techniques and procedures used to determine the Young modulus for a metal

investigating the young modulus of a wire

• measure the diameter of a wire

• calculate its cross-sectional area

• attach the wire to a clamp at the end of a table

• keep the wire held across the ends of the table

• attach a marker to the wire

• place a metre rule underneath the wire

• measure the length of the wire up to the marker

• hang weights off the end of the wire

• measure the new length of the wire up to the marker

• calculate the extension

• repeat five times

• calculate the stress and strain for each weight and extension

• plot a graph of stress against strain

• determine the gradient of the linear part of the graph