Use 2kg at ends, about 2.5kg in center, so that mass of pulley 
negligible.
To find the forces on a pulley one can compare the situation photographed here with the situation when a pulley is replaced by a metal ring.
Compare with similar weights attached to ring, as in "Sums of Forces"(1j30.26)
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Use 2kg at ends, about 2.5kg in center, so that mass of pulley |
| Start with |  |
Also: |  |
Move scale to different vertical positions and find same force (tension) Use 1kg (2kg may be better) and a 20 Newton scale. |
