I posed this multiple-choice question a couple times: when one sees an expression such as 2m, sometimes m stands for "mass". Other times, m stands for "meter". Which of the following is correct about "m" and "2m"? C: When "m" is mass, one should read "2m" as twice the mass. But when "m" is meter, one should read "2m" as "two". E: In both cases, one should read "2m" as "two times m". It's only correct to read it as "two" when m = 1. There were other wrong choices in the multiple-choice question, irrelevant here.
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.
I posed this multiple-choice question a couple times: when one sees an expression such as 2m, sometimes m stands for "mass". Other times, m stands for "meter". Which of the following is correct about "m" and "2m"?
- C: When "m" is mass, one should read "2m" as twice the mass. But when "m" is meter, one should read "2m" as "two".
- E: In both cases, one should read "2m" as "two times m". It's only correct to read it as "two" when m = 1.
There were other wrong choices in the multiple-choice question, irrelevant here.
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