alleryWhich statement about a body in dynamic equilibrium is correct?
ANet force is non zero but velocity stays constant
BNet force is zero and the body accelerates
CNet force is zero and velocity stays constant
DNet force is constant and body decelerates
Answer & Solution
Correct answer: C. Net force is zero and velocity stays constant
1. Dynamic equilibrium means the body keeps moving with constant velocity.
2. Newton's first law states that no net force is needed to maintain constant velocity.
3. Hence the net force on the body is zero.
4. The body experiences no acceleration in either magnitude or direction.
5. Options A, C, D contradict either the zero-net-force or the constant-velocity requirement.
_Source: Selina Concise Physics ICSE Class 10, Ch 1 'Force' (icsehelp.com chapter extract)_
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