The Fg represents gravitational force and focuses more on the suspended body. The force that best represents Fg is the weight of a barbell acting on a weight lifter is 80 N. the answer is letter B.
The force which best represents Fg is option B The weight of a barbell acting on a weight lifter is 80 N.
Since Fg represents the gravitational force of the earth on an object or more simply its weight, which acts downwards towards the earth.
In option A, the force acting acts upwards, so it can't be Fg.
In option B, the weight of the barbell acts downwards.
In Option C, the force on the box is upwards.
In option D, the force acting is the horizotal frictional force which acts in the horizontal direction.
The only option which the force acts downwards is option B which is the weight of the barbell.
So, the force which best represents Fg is option B The weight of a barbell acting on a weight lifter is 80 N.
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