Test Papers – ICSE – Class – X
Physics 02, Pulley Based Problems
Where, two blocks are connected with the help of two strings, okay. Now, we need to find
tension force in both the strings, okay, free body diagram. So, make a free body diagram of
5kg block. We have told you about WTN. There is 50 Newton weight, down, now see this,
this string pulls the 5kg block upwards, isn’t it right. String force is always pulled. So I will
show you one more technique. The tension force arrow will be away from the body. The
arrow of tension force that will always be, away from the body. Suppose, if I write the
tension of this string , it will be like that, so there will be tension ‘T’, so, ‘T’ in this string.
Now, we will make FBD of 10kg. We will make FBD very systematically. First of all, W, now
‘T’, tension. Now, in this 10kg block two strings are attached. So, the tension of this string of
this block will be away from 10 kg. To go away from 10kg the arrow will go this way, right
and if it is same string then how will the tension be, same, so it should be ‘T’. So, this string is
also there, and the tension of this string will also exist, away from the body. Will it happen or
not? Done, so these are the force diagrams.
Now, step 2 is acceleration. 5kg and 10kg are at rest, if 5kg and 10kg both are at rest then it
means both of their acceleration will be zero. If acceleration is zero then it means resultant
force is zero. Means upward force is equal to downward force and right force is equal to left
force, done. So, from the first FBD you will see that T is equal to 50 Newton, done and if we
see the other one then T1 is upper force that should be equal to T plus 100. Where the
value of T, we already know. So, is it okay, so that is called 150 N.
I will ask one question. Does this string pull the 10kg block? Where is it pulling? Okay, you
got ‘T’. Who is pulling 10kg block downward? See, this, remove this one. Ground, it is MG,
obviously, ground will pull it. One is MG, then why have they tied the string, has the string
come here for roaming, if there is a string then you have to pull. So, this 10kg is being pulled
down with the help of this 5 kg string. So, this is 5kg pull and this is ground pull and this is
upward string pull, okay. Thank you, I have my own supporters, she is saying that I have told
about this, definitely I had told. This tension will be away from the body because we are
pulling; this way is generally called push. Pull means it goes away. That is why we can
understand that the arrow of tension will be away from the body. Are you all awake?
Find the tension force in each string. There are three blocks connected by three different
strings, we need to find tension in each string. Your method should be systematic. Each and
every student first should draw the free body diagram. 2 kg and then 4 kg and then 6 kg,
make different FBDs of the three blocks. Draw all the forces. We will check FBD, what are
the marks for FBD, out of 10 marks question, 9.5 marks is for FBD and 0.5 is for the answer.
Okay, now let’s make FBD, everyone did it. Everyone will check it. 2kg, 4kg. How many
students have got it correct? From here, one can say T is equal 20, this will be T1 is equal to
T plus 40, that means T1 is equal to 60. If we see from here, what will T2 be, T1 plus 60 that
means 120 Newton. How many students have done it correctly? Okay, done.
Now, listen carefully. This is all about good observation. I will explain to you nicely this full
story, if you will stop making this FBD then you are finished. I will show you a new technique,
but that is only for final situation. You have to make FBD continuously if you want to learn. I
think in a very simple way without applying any logic and equation. Tell me one thing, what
is the work of this string in this world. To hold 2kg block, right. What is the weight of 2kg
block? 20, so 101% the tension should be 20 Newton. Okay, it has to hold, so upward force is
equal to downward force. So, tension should be 101% that is 20N. So, is there any physics in
this, no, there is no physics, okay. Weight is not physics? It is a little, I am joking. Now, what
is the work of this string in this world? To hold both 4kg and 2kg that means how much total
weight it has to hold? 6kg. So now tell what will be the tension of this string? Really, okay.
And now, what is the work of this string in the world? So, what will be the tension of this
string? That is logic oriented. But this comes later, first is this, because what you will do in
school, will you keep paper on top in this way and solve it? There you have to do it in detail
and logically. As I told you that this problem can be solved with common sense, and see you
got the answer very quickly. Done, move, next.
Find the tension in string and acceleration of block. Did you understand what the meaning of
this is? What is the meaning of this thing? That we have pulled this string with 60 Newton.
Yes or no. Listen carefully. I will do this question. Then you do it the rest. This is the tough
one. And you people can do the easy questions that come later. Students, understand its
meaning, it has come many times, all of you listen carefully. This end you are pulling with 60
Newton means you are pulling the tension of this end. Means what will be the tension of
this end, 60 Newton. Means that force indicates that you already know the tension of this
string. How much is it – 60 Newton? So, on this block you are getting 60 Newton tension is
there upwards and the weight 40 is downwards, isn’t it. 60 is greater than 40 that means
where will the block move, upwards. You made FBD and assumed acceleration. Now, what
you will write, resultant force. Big force minus small force is equal to 4 into a. So, f into a is
consequence. What is the forced applied, 60 and 40. So, this 20 is equal to 4a, so a is equal
to 5. My motive behind this example was that you try to understand this information. And
this will be repeated in our topic a thousand times. So, after this you shouldn’t make any
mistakes and you have been given the tension of this string in the exam. Okay, note down,
that’s an important example.
Next, find the acceleration of the blocks and the tension force in each string? We have to
mention tension of both the strings and the acceleration. What do you have to do? Follow
the steps, make the FBD, assume acceleration, write the equation and solve it. See, I will
show you have to save time. Write the FBD here only. But there is one difficulty here, I have
drawn a very neat FBD, you will be able to understand it and if you also draw like this a neat
and clean FBD you will be able to solve, otherwise you will be confused. See, I will do 40, 60,
okay, T, T. Has everyone done it? Now, how much this will be? 120 N, okay, where should
this system work? How did you take that decision? Total force is 120, and total weight is 10.
What is the total weight, 10, means if I see the downward weight, how much will it be? 60
Newton and what is the force used 120. So, the system should go upward. If I put 80 Newton
instead 120 then?
CA IPCC Strategic Analysis Module 11
Bacchalog, let’s see Ansoff’s Matrix, 4 marks question, right, so Igro Ansoff’s matrix is called father of S.M, now here you can say he gave market penetration, he gave market development, right, product development and diversification correct, existing product, new product or may be in existing market or may be in new market correct bacchalog, so on the X axis we have product and in Y axis we have market so now here in we can see the blue square it represent existing product in existing market that is called as market penetration right and new product in existing market is product development that’s yellow colour and in green we see new product in new market right and in light green we see new market and existing product that is market development, now Igro Ansoff’s matrix market penetration, to sell existing products into existing markets like maruti Suzuki right, nothing new, more aggressive promotion, advertisement can be achieved by more sales to present customers, increasing the usage frequency, new application, etc. Penetration is also done by effort on increasing usage by existing customers, next we see market development, existing products in new markets can be achieved through example micromax, new geographical markets right kids.
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CA IPCC Strategic Analysis Module 10
Bacchalog lets see naya module GE model now on vertical axis we see size of the market, growth rate, industry profit, intensity of competition, segmentation, economics of scale right that’s your Y axis, now the X axis that is the horizontal axis, market share, profit margin, market right, share growth rate and ability to compete knowledge of customer, weakness management caliber etc. Now here in green stand for go ahead expand, two number that’s yellow stands for wait and see hold stability, red stop divest, retrench, right kids. So now here in on X axis, business potion high, medium, low on Y axis market attractiveness high medium low right so green indicates.
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CA IPCC Strategic Analysis Module 9
Hi kids, new module let start with BCG Growth share matrix given by Mr. Bruce, CEO of Boston consulting group from 1963 to 1980 right now here in he described everything with star, question mark cash cow and dog, let us understand ok, now here in X axis you can see relative market share which is low, high and on the Y axis you can see market growth rate right lets check number one BCG growth share matrix stage II stars SBU’s that grow rapidly, they also need heavy investment to maintain their position, finance and their rapid growth potential. Best opportunity for expansion. Make more right investments. Forward and backward integration and market expansion. Cash cows, now these are those companies or products right with low growth and high market share. They generate cash and have low costs. They are established successful and needless investment to maintain their market share. In the long run when the growth rate slows down stars become cash cows. Question Mark, they are problem child or wild cats, low market share in high business growth. Heavy investment low potential to generate cash. If unattended capable of becoming cash traps, we need to decide whether to strength them or sell them. Dogs finally, low growth, low share, sometime they need cash to survive. We need to decide divest, liquidate or retrench. BCG right, after classifying the SBU’s as above what role will be played by each future. There are four strategies available, build to increase market share. Hold to preserve market share.
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CA IPCC Strategic Analysis Module 8
Lets see the new module ADL matrix right, Arthur d’ little matrix is portfolio analysis method based on product life cycle. Two dimensional, industry maturity and firms competitive position and business right. Strength assessment, lets check here you can say stage of industry maturity, embryonic that is introduction, growth, mature and ageing out and competitive position, dominant right, so lets check for dominant, fast grow build barriers, act offensively, hold the position or all out push for share and under growth, fast grow, attend cost leadership, renew defend position, act offensively, hold position or share, under mature, dominant defend position, attend cost leadership, renew fast grow, act offensively, ageing, defend position, renew focus, consider or may be withdraw, now lets see strong position, differentiate fast grow attempt to improve position, differentiate lower cost attack small firms right attempt to improve position, lower cost focus, differentiate grow with industry, hold position with industry, find niche right hold niche harvest, hold position next favorable differentiate fast grow selective attempt to improve position, focus differentiate, attempt to improve position.
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CA IPCC Strategic Analysis Module 7
This chapter is very important from the point of view of product portfolio analysis the entire chapter is made up of you can say product portfolio analysis abhi kya hota hai ye product portfolio analysis now it is the bunch of products offered by the company to the people it can be for example Maruti Suzuki cars right they offer very low segment cars, medium and high segment cars right for all different, different pockets ya phir you can call it as different, different segment correct and which needs to be updated on regular basis and they need to see that whether their sales are not decreasing for that for that reason they need to update such things again and again they need to be constant in touch with the market conditions that is product portfolio analysis check in, analyzing again and again what product are you offering to the costumers, costumers are happy, they want some kind of change, what they want, strategic business unit, analyzing portfolio may be begin with identifying key business, also termed as SBU now SBU can be a company division, a product line, even a single product or it may be a brand right is SBU, has a own set of competitors, has manager responsible for strategic planning and profit single business or collection that can be planned for separately, experience curve similar to learning curve which explains efficiency gained by workers through repetitive productive work. Lager firms have lower unit cost compared to smaller firms. Now let us see alright all these three important concepts to understand different models of portfolio analysis. Now very first we see PLC product life cycle, here the main advantage of PLC is that it can be diagnose portfolio of products in order to establish the stage at which each of them exist, now here in we are gone see right the life cycle, the product life cycle right kids on the X axis we have time right.
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