According to Newton's second law of motion, if we have a rigid, unchanging mass and we observe it accelerating, what must be happening?

A.
a force is being applied to the mass

B.
a force was once applied but is now not being applied

C.
no force was or is being applied to the mass

D.
the mass MUST be changing

@invinceble

Question

According to Newton's second law of motion, if we have a rigid, unchanging mass and we observe it accelerating, what must be happening?
 
 A.
a force is being applied to the mass
 
 B.
a force was once applied but is now not being applied
 
 C.
no force was or is being applied to the mass
 
 D.
the mass MUST be changing

@invinceble

anonymous · Answer

@ganeshie8

jfraser · Answer

"The behavior of all objects can be described by saying that objects tend to "keep on doing what they're doing" (unless acted upon by an unbalanced force)." http://www.physicsclassroom.com/class/newtlaws/Lesson-1/Newton-s-First-Law

anonymous · Answer

Its A. a force is being applied to the mass