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Unformatted text preview: 24 Chapt. 2 One-Dimensional Kinematics positive, and about which object is chosen as defining the relative reference frame is almost the whole problem. For the last question, ask yourself do BOTH of the trains have to accelerate relative to the ground in order to arrange an innocuous collision? b) What is the magnitude of relative acceleration in g s (i.e., in units of the gravitational acceleration)? Acceleration expressed in g s is called the g-force which is misnomer since it is an acceleration, not a force. c) Fundamentally unaccelerated frames of reference are called inertial frames. Its hard to find an exactly inertial frame actually. But approximate ones are common. The ground is approximately an inertial frame of reference for most, but not all human, purposes. In non-inertial frames, there are what are called inertial forces (or fictitious forces). Consider a frame moving in a straight line and accelerating relative to an inertial frame: e.g., the ground. If no real forces act on an object observed in this accelerated frame, the bodyground....
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This note was uploaded on 11/16/2011 for the course PHY 2053 taught by Professor Buchler during the Fall '06 term at University of Florida.
- Fall '06