Which statements describe a situation in which work is being done? Select three options.A mover carries a box up a flight of stairs.A mover holds a box with an upward force while moving it horizontally.Wind blows against a steel table anchored to the ground.Wind blows a pool chair across the yard.A weightlifter lifts a barbell off the ground.A weightlifter holds a barbell above the head.
Answer
A
A mover carries a box up a flight of stairs.
B
A mover holds a box with an upward force while moving it horizontally.
C
Wind blows against a steel table anchored to the ground.
D
Wind blows a pool chair across the yard.
E
A weightlifter lifts a barbell off the ground.
F
A weightlifter holds a barbell above the head.
Explanation
Work is done when a force causes an object to move at least partly in the direction of that force. Carrying a box up stairs involves an upward force and upward displacement, and lifting a barbell involves an upward force and upward displacement. Wind pushing a pool chair across the yard also moves it in the direction of the force. The other situations have no displacement in the direction of the applied force, so no work is done by that force.
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