In which situations is gravitational potential energy present? Check all that apply.A person walks up a flight of stairs.A person runs across a room.Wind blows against a steel table anchored to the ground.Wind lifts a balloon into the air.A weightlifter holds a barbell on the ground.A weightlifter holds a barbell straight overhead.
Answer
A
A person walks up a flight of stairs.
B
A person runs across a room.
C
Wind blows against a steel table anchored to the ground.
D
Wind lifts a balloon into the air.
E
A weightlifter holds a barbell on the ground.
F
A weightlifter holds a barbell straight overhead.
Explanation
Gravitational potential energy is present when an object is raised above a reference level. Walking up stairs raises the person, wind lifts the balloon, and holding a barbell overhead raises it above the ground. Running across a room and pushing against an anchored table do not raise the objects; a barbell held on the ground has not been raised above the ground reference.
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