Question
Sony says that the acceleration in an object could be zero even when several forces are acting on it. Do you agree with her? Why?
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Answer
Yes, Sony is right because if several forces acting on an object are balanced forces, i.e., their resultant is zero (i.e., $\Sigma F=0$ ), then there is no acceleration of the object.
This may be seen as follows:
From Newton's second law, $\Sigma F=m a$
If $\Sigma F^{\prime}=0, ma =0$ or acceleration, $a =0$
This may be seen as follows:
From Newton's second law, $\Sigma F=m a$
If $\Sigma F^{\prime}=0, ma =0$ or acceleration, $a =0$
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