# what kind of motion indicates a system where the net force equals zero?

## What kind of motion indicates a system where the net force equals zero ?

only accelerating objects

only stationary objects

both accelerating and stationary objects

only objects moving with a constant positive velocity

stationary objects as well as objects moving with a constant velocity

**Answer :**

*The correct answer is:*

*stationary objects as well as objects moving with a constant velocity*

*Explanation:*

*According to Newton's second law, when the net force on an object is zero, then it means that its acceleration is zero. In fact:*

*F = ma*

*where F is the net force, m is the mass of the object, a is its acceleration. From this law we see that when F is zero, a (the acceleration) is also zero.*

*But acceleration=0 does not mean that the object is stationary: it means that the object is either stationary, or it is moving at constant velocity. So, the correct answer is*

*stationary objects as well as objects moving with a constant velocity*

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