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Charlie moves at constant velocity and carries a 5N golden ticket across the room 12m in 10s.
Givens: Draw a FBD representing the direction of the
influencing force, also note the direction of motion
What is the work being done to carry the ticket?
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GPT-5 mini
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Free-body diagram (description):
- Weight: 5 N downward (mg).
- Support/holding force from Charlie: 5 N upward (equal in magnitude).
- Motion: 12 m horizontally (to the right). If there is friction, include a leftward friction and a forward applied force equal to it; if no friction, no horizontal forces are needed.
Work done by the supporting force (or by gravity) while the ticket is carried horizontally:
W = F d cosθ. The supporting force is vertical, the displacement is horizontal → θ = 90°, cos90° = 0.
W = 5 N × 12 m × 0 = 0 J.
So the work done by the vertical forces (and by Charlie in holding the ticket, in the physics sense) is 0 joules. (Net work is also zero for constant-speed motion unless there is friction; internal metabolic work is not the same as mechanical work here.)
- Weight: 5 N downward (mg).
- Support/holding force from Charlie: 5 N upward (equal in magnitude).
- Motion: 12 m horizontally (to the right). If there is friction, include a leftward friction and a forward applied force equal to it; if no friction, no horizontal forces are needed.
Work done by the supporting force (or by gravity) while the ticket is carried horizontally:
W = F d cosθ. The supporting force is vertical, the displacement is horizontal → θ = 90°, cos90° = 0.
W = 5 N × 12 m × 0 = 0 J.
So the work done by the vertical forces (and by Charlie in holding the ticket, in the physics sense) is 0 joules. (Net work is also zero for constant-speed motion unless there is friction; internal metabolic work is not the same as mechanical work here.)
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