Multiple Choice
A hammer can be modeled as a point mass on the end of a long, uniform rod. How far from the head of the hammer is the center of mass?
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15. Rotational Equilibrium
Review: Center of Mass
Multiple Choice
In the context of center of mass, what is a vehicle’s center of gravity?
A
The point where the vehicle experiences maximum friction with the road surface
B
The location where the vehicle’s net external force is always zero during motion
C
The point at which the vehicle’s weight can be considered to act, effectively located at its center of mass in a uniform gravitational field
D
The point on the vehicle that always lies at the geometric center of its outer dimensions, regardless of mass distribution
Verified step by step guidance1
Understand that the center of gravity of a vehicle is the point where the entire weight of the vehicle can be considered to act. This simplifies analysis of forces and torques on the vehicle.
Recall that in a uniform gravitational field, the center of gravity coincides with the center of mass, which depends on the distribution of mass within the vehicle, not just its shape or size.
Recognize that the center of gravity is not necessarily at the geometric center of the vehicle's outer dimensions, because mass may be unevenly distributed.
Note that the center of gravity is not the point where the vehicle experiences maximum friction, nor is it the point where the net external force is always zero during motion.
Therefore, the correct conceptual understanding is that the vehicle’s center of gravity is the point at which the vehicle’s weight can be considered to act, effectively located at its center of mass in a uniform gravitational field.
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