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# Physics/Expert Profile

## Steve Johnson

U.S.
Available
##### 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 in the area

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

I went into Physics because it was the first material I both liked and understood in high school. I did well in my first year of college Physics, but the later years required higher math than my comfort level so after earning my BS degree in Physics, I switched into Engineering for my MS degree.

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### Recent Reviews from Users

K = Knowledgeability    C = Clarity of Response    P = Politeness
Eddie10/21/16101010Thank you Steve! I really appreciate your .....
David10/07/16101010
Birol09/12/16101010Thank you Steve for your help, I .....
Muhammad09/06/16101010Thanks for the detialed resposne with full .....

### Recent Answers from Steve Johnson

#### 2016-10-19 Lenz's Law and the direction of a magnetic field in a transformer:

Hello Eddie,    The magnetic field in the core is a vector. In fact, it is the resultant vector of 2 component vectors. The primary generates one of the components. (For this next statement, I need to

#### 2016-10-08 Newton's Laws of Motion:

Hello J,    When you are in an accelerating plane, or car, you sink back into the backrest. This compresses the cushion in the backrest which in turn (due to Newton's 3rd Law) gives you enough force in

#### 2016-10-02 Electron momentum and resistance in a conductor:

Hello David,    I can agree that the contrivance would rotate due to the principle of conservation of momentum. But very slowly. The mass of the free electrons making up the current is so much less than

#### 2016-10-01 Chemical reactions between acids with acids.:

Hello Prashant,    First, I have to caution you to be very careful if you are tempted to mix any acids yourself. I have learned that some combinations have a potential for a dangerous reaction. This was

#### 2016-09-21 Help:

Hello Aishwarya,    I was not able to find the previous year questions you suggested that I view. Several of the links I tried, once I was in the CBSE webpages, did not work. Go to this website for a list

Physics