If an object weighing 50N displaces a volume of water with a weight of 10 N, what is the buoyant force on the object?

Question

BlackTom AI · Accepted Answer

To approach this problem, recall the principle behind buoyancy: the buoyant force equals the weight of the fluid displaced by the object. Here, the object displaces water that weighs 10 N, so the buoyant force on the object is 10 N.
Option 60N: This would imply that the buoyant force adds to the object's weight to reach a total of 60 N, which is not how buoyancy is defined. The buoyant force is not an extra force acting on top of the weight to increase it; it is the upward force that counters part of the weight.
Option 10N: This matches the correct definition and calculation, since the displaced water weighs 10 N and that weight is the buoyant force exerted upward on the object.
Option 40N: This might arise from subtracting or misattributing forces (e.g., 50N weight minus 10N buoyancy equals 40N of net downward force), but that calculation confuses net force with the actual buoyant force.
Option 50N: This represents the object's own weight, not the buoyant force. The buoyant force is independent of the object's weight and equals the weight of the displaced fluid, which in this case is 10 N.

FFP001 Skills and Content Test 2 | LA044- Requires Respondus LockDown Browser

If an object weighing 50N displaces a volume of water with a weight of 10 N, what is the buoyant force on the object?

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