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Chima Sunday (Tutor)
02-03-2016 13:12:00 +0000
Today we are going to take a new dimension. Basically, we will be discussing on Motion, but our priority will be on solving motion related problems often tested in JAMB and other exams. So sit tight and have a nice tutoring hour. Don't forget to come along with your questions, and were you need more explanations, and i promise to do the best within my power to make the time worth.
Welcome and enjoy your time.
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If you had to think consciously in order to move your body, you
would be severely disabled. Even walking, which we consider to
be no great feat, requires an intricate series of motions that your
cerebrum would be utterly incapable of coordinating. The task of
putting one foot in front of the other is controlled by the more prim-
itive parts of your brain, the ones that have not changed much since
the mammals and reptiles went their separate evolutionary ways.
The thinking part of your brain limits itself to general directives
such as “walk faster,” or “don’t step on her toes,” rather than mi-
cromanaging every contraction and relaxation of the hundred or so
muscles of your hips, legs, and feet.
Physics is all about the conscious understanding of motion, but
we’re obviously not immediately prepared to understand the most
complicated types of motion. Instead, we’ll use the divide-and-
conquer technique. We’ll first classify the various types of motion,
and then begin our campaign with an attack on the simplest cases.
To make it clear what we are and are not ready to consider, we need
to examine and define carefully what types of motion can exist.
Motion involves a change of position of a body with time. The study of motion without involving the cause of it is call Kinematics
Types of Motion
a) Random Motion: Here body moves in a haphazard or disorderly manner. Example is the Brownian motion, motion of smoke particles etc.
b) Translational Motion: here body moves from one point to another without rotating. E.g is the motion of a boy running from one goal post to another, a ball rolling vertically upward. etc
c) Rotational Motion: It involves motion of a circle about a center or axis. E.g rotation of the fan blade, motion of the wheel of a moving car. etc
d) Vibratory Motion: In this kind of motion the path of a moving body is repeated at a succesive equal intervals of time. E.g is the motion of devil as described in the christain bible, motion of a simple pendulum. etc.
Parameters of Motion
i) Displacement is defined as the distance travelled in a specified direction
ii)Speed v is the rate of change of distance with time. v= s/t. Speed is said to be uniform if s/t is constant through out the journey.
Velocity is speed calculated in a given direction[recall that distance is for speed and rate of change of displacement is for velocity]
iii)Acceleration a is the rate of change of velocity increase with time While De acceleration is the rate of change of velocity decrease with time. a = v/t.
A motion is said to be a uniform acceleration if v/t is constant through out the journey e.g is the acceleration due to gravity.
Equations of Motion
If a body starts with initial velocity u, accelerates uniformly along a straight line with acceleration a and covers a distance s in a time t when it velocity reaches a final velocity v. then
s = (v+u/2)t ...............................(1)
a = v-u/t; v = u + at ......................(2)
Eliminating t in (1) and (2) to obtain
v2 = u2 + 2as ........................... (3)
Eliminating v in (1) and (2) to have
s = ut + (1/2)at2
These four equations are used in solving problems associated with uniformly accelerated motion.
02-03-2016 13:18:00 +0000
OK we're set
02-03-2016 13:58:00 +0000
Chima Sunday (Tutor)
once again i welcome you all to our today's tutorial class. i still remain my humble self, your one and the only tutor in this forum. Don't think my name has actually changed still my self. You can post your question or go through the script above to see if you really understand, then in absent of any questions i will bombard you guys with my own questions once again welcome @Oluwaseun Babatope, Francis David and co.
02-03-2016 14:07:00 +0000
Can any one try this?
(Jamb 2013 Question 6) A train with an initial velocity of 10ms-1 is subjected to a uniform deceleration of 2ms-2. The time required to bring the train to a complete halt is
Option A 5s
Option B 10s
Option C 20s
Option D 40s
recall from equations of motion that v = u + at, were symbols have there usual meaning.
by subject formular
so t = (v - u )/a. since a is decelerating a = -a, final velocity v = 0
then t = -u/-a = u/a = 10/2 = 5s.
answer is option A.
02-03-2016 14:14:00 +0000
hey hope i got some student in here were have they gone to @Oluwaseun Babatope Francis David etc
02-03-2016 14:26:00 +0000
Ok this is another one here?
Question 9 An object is moving with a velocity of 5m/s. At what height must a similar body be situated to have a potential energy equal in value with kinetic energy of the moving body?
Option A 25.0m
Option B 20.0m
Option C 1.3 m
Option D 1.0m
for this to happen, we equate the p.e =k.e
i.e kinetic energy = potential energy
(1/2)mv^2 = mgh. observe that m cancels
so h = (1/2)v^2/g = 25/20 = 1.3
so answer is option C.
02-03-2016 14:30:00 +0000
02-03-2016 14:32:00 +0000
Thought you will miss todays class you must be a very serious student @Jibo Khadijah. Anway you are welcome ok. Yah which question number are you answering dear?
02-03-2016 14:37:00 +0000
02-03-2016 14:38:00 +0000
there's no one
02-03-2016 14:39:00 +0000