Browse Questions

# If the forces acting upon an object are balanced, then the object

(A) must not be moving.$\quad$ (B) must be moving with a constant velocity.$\quad$
(C) must not be accelerating.$\quad$ (D) none of these

Toolbox:
• Newton's first law states that when viewed in an inertial reference frame, an object either remains at rest or continues to move at a constant velocity, unless acted upon by an external force.
Answer: (C) must not be accelerating
The answer could be A (but need not be) and it could be B (but doesn't have to be).
An object having balanced forces definitely cannot be accelerating. This means that it could be at rest and staying at rest (one option) or could be in motion at constant velocity (a second option). Either way, it definitely is not accelerating - choice C of your four choices.