Question

A body is said to be in dynamic equilibrium when _______.

[1 mark]

• A. the net acceleration is zero
• B. the net mass of the body is zero
• C. the net velocity of the body changes with time
• D. the net acceleration is maximum

Answer 1

The correct option is A the net acceleration is zero

• An object is said to be in dynamic equilibrium when the sum of all the external forces acting on the object equals zero. Since force is directly proportional to acceleration, it can be inferred that net acceleration is zero in the case of dynamic equilibrium.
• The velocity of an object is constant when there is no net force acting on it.
• There is no correlation between the mass of the body and the dynamic equilibrium. So, it does not depend on the net mass of the body.