How To Soar in PSLE - BTPS Way!!
Interact with complex questions / graphs / pictures to pick up valuable clues (don't highlight - just use your pen to underline words or scribble notes)
Start with Booklet A and do it meticulously with full focus - explore all 4 distractors before making final choice.
MANAGE your TIME - to score well, you need to try to finish ALL questions.
Specific answers = answers that are relevant to question.
When confused, choose any of the following strategies:
1. Ask, "What Science idea is being used in question?"
2. Pose other questions to clarify your thoughts
3. COMPARE to another set-up
4. COMPARE to a reverse situation
5. Connect to your knowledge in life (yes, you do have lots of prior / other knowledge)
6. Break down your answer in steps before crafting final answer.
Common problems with wrong answers:
*Answers are generic/vague and do not connect to that specific question
*Answers are not scientific and do not explain using Science ideas
*Answers do not make use of data provided when asked
*Answers did not make comparisons - use words like more/most etc..when asked
BTPS supports all P6 in achieving their PSLE GOALS!!
Tools and Simple Machines
The picture above shows 2 tools (ring spanner on left and spanner on right end).
What simple machines are used here? Explain using 'science language'.
Why is it necessary to produce various sizes of such a tool? Explain clearly by supporting your answer with valid reasons.
Science Around Me (SAM)
SAM is a Science journal that allows pupils to express themselves in their favourite ways about Science.
SAM is another great opportunity for pupils to THINK and TALK Science in a medium that is customised to their learning styles.
SAM allows teachers to informally assess understanding of the child and clarify misconceptions in their learning.
When Ice Changes into Water by Goh Chee Yan - 5G
Do you wonder whether the mass of ice changes when it melts into water. Try this out:
1. Put a few ice cubes into a plastic bag
2. Tie the mouth of the bag tightly
3. Weigh the bag of ice cubes (if there is condensation outside the bag, wipe it dry before weighing)
4. Place the bag in the sun
5. When ice has melted, wipe the outside of the bag dry (refer to step 3)
6. Weigh the bag
You will discover that the mass of the bag remains the same!
There is no change in mass when ice melts!!
The picture above shows 2 tools (ring spanner on left and spanner on right end).
16 comments:
Lever is used as the load is the screw and the effort is at the other end and the fulcrum is in between the load and the effort.
various size are needed as some of the screw are bigger while some is smaller.When it is smaller the amount of effort needed is lesser while when the srew is bigger the amount of effort needed is more.
If the srew is smaller the distance from the fulcrum to the effort is shorter compared to if the screw is bigger.
Lim Zhi Xiang
A member of the 6grace family
a lever is used,as there is a load,fulcrum,and effort.it is a first class lever.different sizes are used for different sizes of screws.more effort would be needed when diffrent sizes are used.furthermore,it would not fit.
nadiah(6faith)
Its a lever ... the handle is the place where you exert the effort the load is the screw the fulcrum is just behind the load ...i think wheel and axle is also included so maybe if i take the larger (handle-wheel)the effort needed maybe less
Kelvin Ruty (6 Grace)
The ring spanner is shorter than the spanner thus the effort needed to move the same load is greater.In levers ,the fyrther the force is applied away from the fulcrum, the less effort is needed.
The spanner is a compound machine. A compound machine has two or more simple machines in a single object to reduce the effort needed.It consists of the Lever and the wheel and axle.The lever reduces the effort but the effort needs to travel a longer distance.
-Benjamin Wong
6Grace
Erm... does lever have to be when the effort goes down, the load goes up or the other way round?If it does not need to be like that, then I think the spanner is a leaver,the load where the screw will be,the fulcrum in the middle and the effort at the other end(if i am not wrong).The wheel and axle is also used in the spanner.The handle is the wheel and the part where is connected to the screw is the axle.Various sizes is neceesary because it only makes sense when we want to unscrew a small screw with a smaller spanner and a big screw with a bigger spanner.The size of the 'axle' is has to fit the screw too.If the size does not fit the screw, then there is no need for a simple machine.For example, when buying clothes,why do we try before buying, it is because if the shirt is too big,then it would now be comfortable to wear and if it is too small then you cannot even wear it and there is no use for a shirt anymore.Spanners are also the same.
Pauline
the effort would be our hands when we apply effort on it to turn the screw or nail and the load would be the nail or screw and the fulcrum is in between the load and effort various sizes are needed as there are different sizes of screw some are big and while others are small
tobias 6hope
It is lever. It is necessary to have various sizes of such a tool as there is different effort needed in various sizes of such a tool.
If the tool is bigger there will be more effort. We use bigger tool as the load acquire more effort.
It is easier than useing the smaller tool as the smaller tool will acquire us more effort while bigger needed only small amount of the effort.
My conclusion is that if there is various sizes of the tool, it means it is needed in various sizes of the load.
Jin Yun Na of 6Grace
To me the wheel and axle is the most obvious. The wheel is actually where we are turning. Lets say if there was a screw on the ring spanner, the we would have to turn the spanner side to turn out the screw. So that makes the spanner side a wheel. But where is the axle? The axle is actually the turning screw. If nothing was turning due to the turning of the wheel, then it cannot be called a wheel and axle.
Various sizes are needed because the sizes of screws are different. If all of the screws were so called in M size, and the spanner is in L size, then when we are screwing it would take forever. Why? Because then size of the spanner is too big and thus, would not fit the size of the screw. Not only will the screwing take a long time, it would also not make the screwing tight. Therefore, making the item that was being screwed on very loose and unsafe.
Xinyi 6Grace
I think it is the wheel and axle.The part that we hold is the wheel and the nut is the axle.Because when you use a lever, the effort and the load goes in different direction(when on sea-saw on goes up the other goes down)but when the spanner turns clockwise, the nut also turns clockwise and when we use a wheel and axle, the load and the effort also moves in the same direction
Ruyan(6grace)
The use of having different size is because, when you have a smaller load, you cannot use a super big spanner. Ruyan(6grace)
it is a lever.the fulcrum is in the middle,the effort is at the handle and the load is at the opposite end.various sizes of such tool is used as there would be different types of load which has a greater or a lighter mass so the effort applied has to depend on the load.by using different tools will help reduce the effort used.~audrey 6grace
I think that the simple machines used are the whell and axle as well as levers. The place where we are applying the effort is the wheel and the turning screw is the axle.
Various sizes are made as when you use a smaller spanner to unscew a bigger screw, it would take a long time as the distance between the edges of the spanner and the screw is too far apart. And if you use a smaller spanner to unscrew a bigger screw, the spanner would not even fit, so how can you unscrew it.
Remus See
Well someone removed my comments T.T i posted in every section.
Lee.S.H~
A lever is used as it have a load, fulcrum and effort.Different sizes are used for different screws.If the screw is smaller, you will use lesser effort but if it is bigger, you will use more effort.
Alex Lim
(6H)
The simple machines which are used include a lever and wheel & axle. The lever is used when unscrewing/screwing in a screw and extracting it out from any object. The wheel & axle is used also to extract a screw, but it reduces the effort needed further.
~Nicholas King(6C)
I think that this is a complex machine, a combination of wheel and axle plus a lever.It is a lever because it has a load, fulcrum and effort.It is also a wheel and axle because the place where the effort is applied is the wheel while the rotating screw is the axle.
Different sizes of spanners are needed for screws of different sizes.
Cheo Kee Jin
6 Charity
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