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If the acceleration of a system is zero, are no external forces acting on it? what about internal forces? explain your answers.

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kritter1
It is not possible for an object to have no external/internal forces acting on it. To have an acceleration of 0, the forces acting on the object balance out, leading to the object remaining static. 

Hope I helped :) 

Answer:

Yes

May not be zero

Explanation:

a) When a acceleration of a system = 0

F = m*a = 0

Hence,

All resultant external forces are zero

b) A system may consists of multiple masses or objects interacting with one another. Hence, those internal are non zero for the system to remain intact

E.g two boxes riding on one another moving at a constant speed.

Hence, a single object system has zero internal forces; however, a multiple objects system will have non zero internal forces

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