Week 3 notes for PY 205
Week 3 notes for PY 205 PY 205
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This 1 page Class Notes was uploaded by Iman Usmani on Saturday January 30, 2016. The Class Notes belongs to PY 205 at North Carolina State University taught by Professor Dougherty in Winter 2016. Since its upload, it has received 10 views. For similar materials see Physics for Engineers and Scientists in Engineering and Tech at North Carolina State University.
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Date Created: 01/30/16
PY 205 Week 3 Notes Chapter 4 and 5 Newton’s Laws 1. Velocities don’t change unless a net force acts upon it (qualitative) 2. The acceleration of a body is directly proportional to the net force acted on it (quantitative) a. Fnet = (mass)(acceleration) 3. Forces occur between two objects – if A exerts a force on B then B exerts a negative force on A. a. Fnet = Fxi +Fyj + Fzk b. The sum of all the forces on x = ma(x) c. The sum of all the force on y = ma(y) Applications of Newton’s laws - Kinetic motion - sliding friction - The force acts opposite to the direction of the object’s velocity - Normal force = shows that the friction force is approximately proportional to the normal force – the force that either object exerts on the other side and is perpendicular to their common surface contact o Force = Fnormal X the constant - Static friction – when a force parallel to the two surfaces can arise even when they are not sliding o Exceeding the maximum coefficient – where the constant is the coefficient of static friction
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