A is the independent variable and f is the dependent variable or vary A and measure f 1
keep M constant 1
Methods of data collection
labelled diagram of workable experiment including: 1
• elastic cord fixed at one end to a support
• other end passed over a pulley
• labelled pulley
• labelled load
vibrator connected to signal generator 1
increase/decrease the frequency of the signal generator until stationary wave pattern is observed 1
measure diameter of cord with micrometer/calipers 1
Method of analysis
plot a graph of f 2 against 1 / A or equivalent (e.g. lg f against lg A) 1
relationship valid if a straight line passing through the origin is produced 1
(for lg f against lg A, relationship valid if a straight line with gradient –½)
M 1
k=
gradient × 4 × L2
(for lg f against lg A, k = M / [10(2 × y-intercept) × 4 × L2] )
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