4. In a spring experiment the results were as follows:
Force (N)
Length (mm)
Extension
O
50
1
58
2
70
3
74
4
82
5
90
6
102
(mm)
a. What is the length of the spring when unstretched?
50mm
b. Complete the 'Extension' row of the table
c. Plot a graph of length against force. Circle the anomalous point.
d. Mark the limit of proportionality on your graph (elastic limit).
e. What load would give an extension of 30mm?
f. What would be the spring length for a load of 4.5N?
7
125
g. Extension: Determine a value for the spring constant in this example.