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# Physics/Newtonian physics

Question
What is the minimum external force required to change condition of a body in unform motion or in a state of rest?

Hello Sachin,

To consider all cases that you may experience, rather than consider an external force, you need to look at the NET force (which is the vector sum of all forces acting on the object). If there is a non-zero net force on a body, there will be an acceleration of the body. If this non-zero net force is tiny (compared to what the body sees in other situations), the acceleration will be tiny (compared to other accelerations). But the acceleration will have a value that is not zero.

There is no minimum. Any non-zero net force, and the resulting acceleration, will change condition of a body in uniform motion or in a state of rest - whichever the original state was.

I hope this helps,
Steve

Physics

Volunteer

#### Steve Johnson

##### Expertise

I would be delighted to help with questions up through the first year of college Physics. Particularly Electricity, Electronics and Newtonian Mechanics (motion, acceleration etc.). I decline questions on relativity and Atomic Physics. I also could discuss the Space Shuttle and space flight in general.

##### Experience

I have a BS in Physics and an MS in Electrical Engineering. I am retired now. My professional career was in Electrical Engineering with considerable time spent working with accelerometers, gyroscopes and flight dynamics (Physics related topics) while working on the Space Shuttle. I gave formal classroom lessons to technical co-workers periodically over a several year period.

Education/Credentials
BS Physics, North Dakota State University
MS Electrical Engineering, North Dakota State University