PH-621
Principle of moments
Physics · Secondary 3 · Medium · Principle of moments
A uniform plank of negligible weight is balanced horizontally on a pivot at its centre. A 20 N weight hangs 0.8 m to the left of the pivot and another 20 N weight hangs 0.8 m to the right. What upward force must the pivot provide?
- 10 N
- 20 N
- 40 N
- 80 N
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