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Physics 1401

Online Quiz 8

Chapter 8 in Conceptual Physics 12th edition

For an extended object, such as a baseball bat, the trajectory of any given point on the object may be quite complicated. However, the trajectory of one point, the center of mass, is just the same parabolic trajectory that a ball would follow.

Center of mass figure

The center of gravity is a term that refers to the average force of gravity on an extended object. Except for very large objects, such as the moon, the center of gravity and the center of mass are the same point. An object (such as a building) will be in stable equilibrium if a line dropped from the center of mass falls within the base of support as shown below.

Leaning tower of Pisa

For this quiz, just click on the part(s) of the figure to correctly answer the problem.

Question 1. Locate the center of mass for each of the two uniform objects in the figure below.

Question 2.In the figure below, "x" marks the location of the center of gravity for each truck parked on the hill. Select the truck(s) which are unstable and will tip over.


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