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# Physics/Acceleration

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Question
The following is the question:
There is a 2-kg object moving on an runway,which has an inclination of 30 degrees.What is its acceleration?

Answer
Assuming no friction the acceleration can be determined from Newton's 2nd Law: SF=ma.
In this case the component of the gravitational force acting parallel to the incline will be:
Fp=Fg*sin(theta)=m*g*sin(30)
Using Newton's 2nd Law:
m*g*sin(theta)=m*a
Therefore, the acceleration will be:
a=g*sin(30)=9.8*sin(30)=4.9m/s^2

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#### James J. Kovalcin

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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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