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Physics 1 Problem Solutions 28

Physics 1 Problem Solutions 28 - 24 Chapt 2 One-Dimensional...

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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. It’s 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.
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