When must an object be in equilibrium?
A when no resultant force acts on the object
B when no resultant force and no resultant torque act on the object
C when no resultant torque acts on the object
D when the upward force on the object is equal and opposite to its weight
ANSWER: B
The Physics Behind
- Equilibrium is meet only after 2 conditions are satisfied.
- The sum of all forces on the object is zero.
- The sum of clockwise moments equals the sum of the anti-clockwise moments.
- Option B has statement / phrases equivalent to the above.
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