4. Quality of observations/data 

 Consistent data 
Increase m > observe increase in X 
 Accurate measurements/ observations 
Measurements of m and X within g and mm accuracy
of instruments used. 
 Completed data table 
Elongation data for all masses recorded in
table and force calculated for all masses (at least five). 
 Correct units 
m (kg), F (N), X (m) 
 Qualitative description 
* 
5. Graph 

 Curve is appropriate to data trend 
Straight line (best fit) 
 Points plotted accurately 
Points correspond to data values in the table 
 Appropriate scale 
Scales can accommodate range of Force vs Stretch 
 Axes labelled with variables 
Force in newtons, stretch in meters. 
 Variables placed on correct axes 
Force on x axis; Stretch (X) on y axis. 
6. Calculations 

 Calculated accurately 
Calculated accurately with appropriate use
of significant figures. 
 Substituted correctly into relationship 
Data for graph inserted into ratio: delta
F/ delta S 
 Relationship stated or implied 
Slope is the ratio of force over stretch 
 Units used correctly 
Force (N), Stretch (m), slope (N/m) 
 Use all data available 
For slope calculation, the chosen points should
be ON the straight line, far from each other. 
7. Conclusion 

 Consistent with scientific principle 
Correctly and clearly matches scientific principle 
 Sources of error 
* 
 Consistent with data 
Conclusion/answer to question is consistent
with student's experimental data. 
 Relationship among variables stated 
** 
 Variables stated in conclusion 
Force and displacement (or their symbols)
are used in answer. 