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I am teaching or have taught AP physics B and C [calculus based mechanics & electricity and magnetism] as well as Lab Physics for college bound students. I have a BS in Physics from the University of Pittsburgh and a Master of Arts in Teaching from same. I have been teaching physics for 34 years. I am constantly updating my skills and have a particular interest in modern physics topics.

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Recent Answers from James J. Kovalcin

2009-11-07 Speed, time and and distance:

First of all there is no such thing as "all the formulas for the 9th grade"! However, if you a asking specifically about the relationships among distance, velocity, acceleration and time, there are two:

2009-11-06 Speed:

Because this roller coaster is moving in a circular path Newton's 2nd Law applies: SF=m*a where SF is the sum of all the external forces acting on a system and where the acceleration is centripetal a=v^2/R

2009-11-05 Tension and angular velocity:

Because the mass of this pendulum is moving in a circular path it is accelerating and therefore its motion is described by Newton's 2nd Law. Therefore, the sum of the external forces SF acting on this

2009-11-05 Pulleys:

In principle it is only the number of pulleys that matters. However, that completely ignores the reality that friction matters as well. A larger, well constructed pulley [block and tackle] will waste must

2009-11-04 Momentum:

Not at all! Kinetic energy is given by: KE=1/2*m*v^2 while momentum is given by: p=m*v Suppose that one particle has twice the mass of another: m2=2*m1 If their kinetic energies are equal: 1/2*m1*v1^2=1/2*m2*v2^2

 

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