A student investigates the work done to pull a loaded tray across a laboratory bench through a constant distance.
The table shows the student's measurements:
| Mass (kg) | Work done (J) |
|---|---|
| 0.1 | 1.2 |
| 0.2 | 1.6 |
| 0.3 | 2.1 |
| 0.4 | 2.5 |
| 0.5 | 2.9 |
| 0.6 | 3.4 |
Describe how the student can perform this experiment, including any measuring equipment used.
If this data were plotted on a graph of Work done (y-axis) against Mass (x-axis), describe the pattern of the plotted points and the line of best fit.
State the relationship shown by the data between the mass of the tray and the work done to pull it.
The student polished the bench surface to reduce friction, keeping the masses and distance the same.
Describe how a line representing this new polished surface (line P) would compare on the graph to the original line of best fit.
Explain the physical reason for this difference.