Question

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.

Explanation:

$F_g$ represents the force of gravity (weight). The weight of an object is the force due to gravity acting on it. Among the options, the weight of a barbell acting on a weight - lifter is a gravitational force. The other options describe applied forces (weight - lifter pushing barbell upward), normal force (table on box), and frictional force (box sliding on rough table).

Answer:

The weight of a barbell acting on a weight lifter is 80 N.