PH-599
Principle of moments
Physics · Secondary 3 · Medium · Principle of moments
A 20 N child sits 0.8 m from the pivot on a see-saw. To balance the see-saw, what upward force must the pivot provide if the see-saw itself has negligible weight and no other forces act?
- 20 N
- 25 N
- 16 N
- 0 N
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