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The net force on an object does work on that object. What must change as a result?
AIts kinetic energy changes
BIts mass changes instead
CIts weight changes instead
DIts charge changes instead
Answer & Solution
Correct answer: A. Its kinetic energy changes
1. A net force produces an acceleration, so the velocity of the object must change.
2. A change in velocity is a change in kinetic energy.
3. The work energy theorem states that the net work equals the change in kinetic energy.
4. So doing net work on an object always changes its kinetic energy.
5. Mass and weight are unaffected by the work done, which rules out those two options.
_Source: Siyavula Physical Sciences Grade 12 (Everything Science, CC BY 4.0), Chapter 5: Work, energy and power_
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