A student uses spanners of different lengths to turn the same nut.
The student pulls at the end of each spanner, at right angles to the spanner.
The Table shows the force needed to just turn the nut with each spanner.
Table
| Length of spanner in m\text{m}m | Force needed in N\text{N}N |
|---|---|
| 0.10 | 120 |
| 0.15 | 80 |
| 0.20 | |
| 0.30 | 40 |
Calculate the moment needed to just turn the nut.
Use the data for the 0.10 m spanner.
Complete the Table.
Describe the relationship between the length of the spanner and the force needed to turn the nut.
Explain why it is easier to turn the nut with a longer spanner.