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Which force best represents Fg?

A weight lifter is pushing a barbell upward with a force of 90 N.
The weight of a barbell acting on a weight lifter is 80 N.
The amount of upward force of a table on a box is 25 N.
A box on a rough table has difficulty sliding past 25 N of force.

1 answer

The force that best represents \( F_g \) (the force of gravity acting on an object) is the weight of the barbell acting on the weight lifter, which is 80 N.

In physics, \( F_g \) is commonly referred to as the weight of an object, which is the gravitational force exerted on it. In this context, the 80 N force corresponds to the gravitational force acting on the barbell.