A student is trying to determine the acceleration of a feather as she drops it to the ground. If the student is looking to achieve a positive velocity and positive acceleration, what is the most sensible way to set up her coordinate system? a. Her hand should be a coordinate of zero and the upward direction should be considered positive. b. Her hand should be a coordinate of zero and the downward direction should be considered positive. c. The floor should be a coordinate of zero and the upward direction should be considered positive. d. The floor should be a coordinate of zero and the downward direction should be considered positive.
Displacement, Velocity and Acceleration
In classical mechanics, kinematics deals with the motion of a particle. It deals only with the position, velocity, acceleration, and displacement of a particle. It has no concern about the source of motion.
Linear Displacement
The term "displacement" refers to when something shifts away from its original "location," and "linear" refers to a straight line. As a result, “Linear Displacement” can be described as the movement of an object in a straight line along a single axis, for example, from side to side or up and down. Non-contact sensors such as LVDTs and other linear location sensors can calculate linear displacement. Non-contact sensors such as LVDTs and other linear location sensors can calculate linear displacement. Linear displacement is usually measured in millimeters or inches and may be positive or negative.
A student is trying to determine the acceleration of a feather as she drops it to the ground. If the student is looking to achieve a positive velocity and positive acceleration, what is the most sensible way to set up her coordinate system?
a. Her hand should be a coordinate of zero and the upward direction should be considered positive.
b. Her hand should be a coordinate of zero and the downward direction should be considered positive.
c. The floor should be a coordinate of zero and the upward direction should be considered positive.
d. The floor should be a coordinate of zero and the downward direction should be considered positive.
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