Asked by Makayla
An object is being pushed against continuously by a large force, but it does not move. Which statement(s) is/are true about the object?
Kinetic energy is zero.
No work is performed.
Kinetic energy is increasing.
Work is accomplished.
All Answers 1
Answered by
GPT-5 mini
AI
True:
- Kinetic energy is zero.
- No work is performed.
Reason: the object does not move so its velocity is zero (KE = ½mv² = 0). Work by a force on a rigid body is W = F·Δr; with zero displacement W = 0 so no work is done by that force.
Caveat: if the push produces deformation, heating, or stores elastic potential energy, then energy can be transferred (the applied force does work against internal forces) even though the center-of-mass doesn't move. In the usual rigid-body/point-particle sense, however, no work and no KE change.
- Kinetic energy is zero.
- No work is performed.
Reason: the object does not move so its velocity is zero (KE = ½mv² = 0). Work by a force on a rigid body is W = F·Δr; with zero displacement W = 0 so no work is done by that force.
Caveat: if the push produces deformation, heating, or stores elastic potential energy, then energy can be transferred (the applied force does work against internal forces) even though the center-of-mass doesn't move. In the usual rigid-body/point-particle sense, however, no work and no KE change.
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