NewtonsLawsofMotion - Newton's Laws of Motion Speed:...

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Newton’s Laws of Motion Speed: Distance/Time = v Average speed Total distance divided by total time X initial might not be the real starting point o T2 might be better o Be flexible with subscript V = Delta X/ Delta T o Xf – Xi/ Tf-Ti Acceleration Delta V/Delta t Average = “between” Instantaneous = “at” Normalizing the denominator to units time/volume/ect. (the denominator is set to 1) Seconds squared o D/N exist o Acceleration o . Bar over letters = average Test on Wednesday morning February 4 Qui Instantaneous speed Make the interval shorter We have now studied how to describe the motion of an object. This is the field of kinematics . However, we have not talked about why objects move. This is dynamics , and is the next subject that we shall look at. In order to study the dynamics of an object, indeed, even to study the kinematics of an object, we must choose a coordinate system. Remember that coordinates are man made systems that we use to help us convert a physical situation to a mathematical model. Unfortunately, there are infinitely many coordinate systems that we could chose. Is there some way of consistently choosing a useful one? The answer is yes, but in order to fully understand why, we must define an inertial frame of reference . An inertial frame of reference is one in which the object that the coordinate frame is attached is at rest or is moving at a constant velocity . Thus, a car speeding up to get on the freeway is not an inertial reference frame, but once the car is on the freeway and moving with a constant velocity it is. Thus, in order to choose the proper coordinate
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This note was uploaded on 07/24/2009 for the course PHY 092342 taught by Professor Knott during the Spring '09 term at Cosumnes River College.

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NewtonsLawsofMotion - Newton's Laws of Motion Speed:...

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