If an object isnt moving, no external force acts on it, Physics

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Q. If an object isn't moving, no external force acts on it.

No it is always not true, there would be balanced forces which cancel each other out leaving no net force. Example: Sitting on a chair, the chair pushes up on you while gravity pulls you down, but you aren't going anywhere because those forces cancel each oyher and net force is equal to zero.

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