KINEMATICS
MODULE 1
MOTION ANALYSIS Â - CONCEPTS I
Learn definitions of position and displacement
INTRODUCTION
Module 1 is studied by the parts in which Physics is divided. Mechanics are a part of Physics responsible for studying movement represented by t, and in turn, is divided into Kinematics and Dynamics.
You will begin learning about Physics by studying Kinematics which is the study of movement without taking into account the cause that produces it.
It includes the Cinematic the distance traveled, the time elapsed, the acceleration, the position, among others are used.
Read the lecture below to initiate in kinematics
Here are some important concepts:
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Position: Refers to the location of a mobile (body or particle that moves) with respect to a reference point at a certain time.
In the diagram shown below, you can see the different positions of mobile with respect to the origin of coordinates (the zero), where we have symbolized with the letter X the vector position.
The first position is X1 = 30 m → to N,
the second position is X2 = 50 m → to N,
the third position is X3 = 0 and
the fourth position is X4 = 20 m → to S.
2. Displacement: It is defined as the change of position of a mobile in a given time interval.
This change of position is represented mathematically as follows:
ΔX = Xf - Xo, where Xf represents the final position and Xo represents the initial position of the mobile.
For example, the first displacement is:
ΔX1 = X2 - X1 = 50 m - 30 m = 20 m and it is positive because it is an advance.
Vectorially we can write this scroll like this:
ΔX1 = 20 m → to N.
The second displacement is:
ΔX2 = X3 - X2 = 0 m - 50 m = -50 m and it is negative because it is a backward movement.
Vectorially we can write this scroll like this:
ΔX2 = 50 m → to S.
The third displacement is:
ΔX3 = X4 - X3 = -20 m - 0 m = -20 m and it is negative because it is a backward movement.
Vectorially we can write this scroll like this:
ΔX3 = 20 m → to S.
The total displacement is calculated as follows:
where Xf represents the final position of the whole movement just as Xo represents the starting position. Thus:
ΔXTotal = Xf - Xo = -20 m - 30 m = -50 m
The negative sign in this answer means that the mobile was behind the starting point.
The total displacement can also be calculated by vectorially adding all the individual displacements. That is:
So: ΔXTotal = 20 m - 50 m - 20 m = - 50 m
After reading and watching the video, you should be ready to take the quiz.
The quiz is made up of 5 questions where you must answer with your own words, the definitions of the terms learned. Each question has a value of 20 points. The total score is 100.
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Grade Scale
This course uses the plus/minus grading system.
A = 93 to 100%
A- = 90 to 92%
B+ = 87 to 89%
B = 83 to 86%
B- = 80 to 82%
C+ = 77 to 79%
C = 70 to 76%
D = 60 to 69%
F = 59% and below