Conservation laws: Identify the incorrect attribution Statement to evaluate: "According to the principle of conservation of energy, the total momentum of a system in any direction remains constant unless acted upon by an external force in that direction." Choose whether the statement is correct or incorrect.
Mechanical Engineering
Engineering Mechanics
Difficulty: Easy
Choose an option
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ACorrect
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BIncorrect
Answer
Correct Answer: Incorrect
Explanation
Given dataWe are judging a statement that mixes conservation laws.
Concept/ApproachConservation of momentum (not energy) states that in the absence of external force along a direction, total momentum along that direction remains constant. Conservation of energy states total energy of an isolated system remains constant.
Step-by-stepThe statement assigns a momentum result to the energy principle.Therefore the attribution is wrong.
Common pitfallsInterchanging momentum and energy conservation statements.
Final AnswerIncorrect