In which situation normal force is equal to the wieght of the body?
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when normal force in horizontal.
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Any time an object is experiencing a vertical acceleration,
the normal force acting on the object will not be equal to the weight
of the object.* The classic example for this is to imagine an object in
an elevator. When the elevator is accelerating with acceleration a⃗ , normal force n⃗ on an object with mass m is:
n⃗ =ma⃗ −mg⃗ .
(Note that g⃗ is pointed down, so when we subtract it, we are increasing n⃗ .)
So when the elevator is accelerating upwards, the normal force is greater than the weight. When the elevator is accelerating downwards, normal force on the object is less than its weight.
n⃗ =ma⃗ −mg⃗ .
(Note that g⃗ is pointed down, so when we subtract it, we are increasing n⃗ .)
So when the elevator is accelerating upwards, the normal force is greater than the weight. When the elevator is accelerating downwards, normal force on the object is less than its weight.
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