What did you SEE and THINK based on your experiment? by Ms Su YL https://padlet.com/exco6/o7q0cuzj8t7i Instructions: 1) Write your name and register number under the cell Title en-us 2019-04-02 13:55:42 UTC 2019-04-06 13:34:26 UTC hello@padlet.com Example is shown below. exco6 https://padlet.com/exco6/o7q0cuzj8t7i/wish/347630418 2019-04-02 13:57:24 UTC https://padlet.com/exco6/o7q0cuzj8t7i/wish/347630418 Ms Nilam (43) exco6 https://padlet.com/exco6/o7q0cuzj8t7i/wish/347631050 I see that water has disappear. I think the water disappears because it has evaporated. ]]> 2019-04-02 13:58:22 UTC https://padlet.com/exco6/o7q0cuzj8t7i/wish/347631050 Jolynn Koh (19) https://padlet.com/exco6/o7q0cuzj8t7i/wish/347871420 I see:
1) a hand pulling a block with the spring balance along the 4 different surfaces
2) a block moving (and rubbing) against the 4 different surfaces
3) the amount of force used to move the block on the carpet surface was shown on the spring balance

I think:
1) the pulling force has to be more than the frictional force so that the block can be pulled on the different surfaces
2)]]> 2019-04-03 00:01:51 UTC https://padlet.com/exco6/o7q0cuzj8t7i/wish/347871420 https://padlet.com/exco6/o7q0cuzj8t7i/wish/347871556

]]> 2019-04-03 00:03:01 UTC https://padlet.com/exco6/o7q0cuzj8t7i/wish/347871556 Amberlyn Low (28) https://padlet.com/exco6/o7q0cuzj8t7i/wish/347871557 I see: 
- a block being pulled 
- the block needed to be pulled before it can moved along the carpet surface
I think:
- the block has a pull force acting on it, thus it moved
- the carpet and the block had frictional force between them, so the block needed more force to overcome the frictional force to move]]> 2019-04-03 00:03:02 UTC https://padlet.com/exco6/o7q0cuzj8t7i/wish/347871557 Raeanne Ho™️ https://padlet.com/exco6/o7q0cuzj8t7i/wish/347871561  
I see that there is a hand pulling a block using a spring balance.
I think when she said that enough motion force is needed to overcome frictional force is wrong. She should say that more force is needed to overcome frictional force. It should be either more or less. I also think that if she does the same experiment on the sandpaper surface,she would need more frictional force to pull the spring balance connecting to the wooden block with a hook]]> 2019-04-03 00:03:04 UTC https://padlet.com/exco6/o7q0cuzj8t7i/wish/347871561 Stephanie (36) https://padlet.com/exco6/o7q0cuzj8t7i/wish/347871661 I see: A block is being pulled a hand on the carpet surface
           A pull force is acting on the carpet surface
I think:The block is able to move because more force overcame the frictional force between the surface of the carpet and the block ]]> 2019-04-03 00:03:47 UTC https://padlet.com/exco6/o7q0cuzj8t7i/wish/347871661 Braeden(2) https://padlet.com/exco6/o7q0cuzj8t7i/wish/347871891 I see that the block is being pulled on a carpet surface which has frictional force as it moves but the force of the moving wooden block is more than the frictional force and so the block continues to move even though there is frictional fore opposing it]]> 2019-04-03 00:05:08 UTC https://padlet.com/exco6/o7q0cuzj8t7i/wish/347871891 Zhanxiang https://padlet.com/exco6/o7q0cuzj8t7i/wish/347872155 I see see see see a person pulling a spring balance while the spring balance is hooked on a wooden block ,as the wooden bloke is dragged along with the spring balance.The person pulling the springbalance uses steady hands so the results in the end of the experiment will be accurate. 

I think think think think the block is dragged because the person pulling the block applied more ]]> 2019-04-03 00:06:54 UTC https://padlet.com/exco6/o7q0cuzj8t7i/wish/347872155 Isaac(14)🤑 https://padlet.com/exco6/o7q0cuzj8t7i/wish/347872174 I see:four different surfaces with different amount of frictional forces so more forces than the amount of frictional force on the surface is needed.
I think:That there is no surface that has no frictional forces.
I think:If you add oil or put water to a surface,the frictional force will decreased.Thus when it is raining,the car will slides more easily.
I wonder:If metal has lesser frictional force than plastic?]]> 2019-04-03 00:07:04 UTC https://padlet.com/exco6/o7q0cuzj8t7i/wish/347872174 U Leon{5} https://padlet.com/exco6/o7q0cuzj8t7i/wish/347872207 I see a block being dragged across the carpet. 
I think that the block can be dragged across the carpet because more force overcame the frictional force,causing the block to move. ]]> 2019-04-03 00:07:21 UTC https://padlet.com/exco6/o7q0cuzj8t7i/wish/347872207 Xarius🏀(38) https://padlet.com/exco6/o7q0cuzj8t7i/wish/347872271 What I see:I saw that they managed to achieve a very accurate result.
What I think:I think that the reason why they managed to achieve a very accurate result is because the hand of the person pulling the spring balance was very stable.Thus not allowing any slight pulling force to affect the whole result of the experiment.]]> 2019-04-03 00:07:47 UTC https://padlet.com/exco6/o7q0cuzj8t7i/wish/347872271 Alson 33 https://padlet.com/exco6/o7q0cuzj8t7i/wish/347872337 I see : the wooden block is moving slowly on the carpet surface
I think: that the wooden block moves slowly on the carpet surface as there is more frictional between the wooden block and the carpet, so there must be more force to overcome the frictional force .]]> 2019-04-03 00:08:13 UTC https://padlet.com/exco6/o7q0cuzj8t7i/wish/347872337 https://padlet.com/exco6/o7q0cuzj8t7i/wish/347872484 Tobius chua (8)
I saw a wooden block weighing 100 g and being pulled along 4 different     
Surfaces 
I think that when the block was pulled over the sandpaper it had the most frictional force as the sand paper had the roughest surface this creating the most frictional force

]]> 2019-04-03 00:09:05 UTC https://padlet.com/exco6/o7q0cuzj8t7i/wish/347872484 Eyan(11) https://padlet.com/exco6/o7q0cuzj8t7i/wish/347872515 I see that the rougher the surface,the more motion force is needed to overcome the frictional force.I think that the amount of wind also affects the amount of frictional force opposing the motion]]> 2019-04-03 00:09:20 UTC https://padlet.com/exco6/o7q0cuzj8t7i/wish/347872515 Elianna (10) https://padlet.com/exco6/o7q0cuzj8t7i/wish/347872540 I see someone pulling the block with the spring balance to measure the amount of force needed to overcome the frictional force between the block and the surface.
I think more force is needed to overcome the frictional force between the block and the sandpaper surface than the frictional force between the block and the metal, carpet and plastic surfaces.]]> 2019-04-03 00:09:31 UTC https://padlet.com/exco6/o7q0cuzj8t7i/wish/347872540 Jie Ling (40) https://padlet.com/exco6/o7q0cuzj8t7i/wish/347872669 I see.....
A hand pulling a wooden block
I think...
I think there was frictional force when the two surfaces of the wooden block and the surface was “rubbing” against each other
I think heat energy was produces when there was frictional force
I think the results was a reliable one as the experiment was a fair test and the person pulling the wooden block is very stable
I think there is frictional force and heat energy ]]> 2019-04-03 00:10:30 UTC https://padlet.com/exco6/o7q0cuzj8t7i/wish/347872669 Tan Tze Hung(39)😊 https://padlet.com/exco6/o7q0cuzj8t7i/wish/347872738 I see the wooden block being pulled along different types of surfaces,both rough and smooth. I think that the block when being pulled along the rough surface like the sandpaper,there will be more frictional force between the surface of the wooden block and the sandpaper,compared to the block being along the smooth surface like the metal surface, there will be less frictional force between the wooden block and the metal surface. All this is because of the different types of surfaces that affect the amount of friction between the two surfaces.]]> 2019-04-03 00:11:01 UTC https://padlet.com/exco6/o7q0cuzj8t7i/wish/347872738 Jet(15) https://padlet.com/exco6/o7q0cuzj8t7i/wish/347872797 I see a rough surface and smooth surface where the block is pulled so there is frictional force between the two surfaces,the block and the rough surface.I think that when the block is pulled on top of the rough surface,more motion force is needed to overcome the frictional force but when the block is pulled along the smooth surface,there is less motion force needed to overcome the frictional force.]]> 2019-04-03 00:11:22 UTC https://padlet.com/exco6/o7q0cuzj8t7i/wish/347872797 Miguel™️ (31) https://padlet.com/exco6/o7q0cuzj8t7i/wish/347872833   I see that the wooden block is being pulled by someone. I also see that the wooden block is being pulled on a carpet surface. I see that when the wooden block moves on different surfaces, it took a lesser amount of force to pull the wooden block if the surface is smoother. I see that when the wooden block is being pulled on rough surfaces, it requires more force to pull the wooden block. I see that when a surface is smoother, less frictional force is between the two surfaces. When the surface is smoother, there is less frictional force between the two surfaces. I also see that when the wooden block was pulled on the sandpaper, there were bits of wood left on the surface of the sandpaper

  I think that the reason why there were some bits of wood left on the sandpaper surface is because that the sandpaper surface is the roughest surface and requires the most amount of force to move. Frictional force can stop a moving object so I think that the sandpaper surface was so rough that the frictional force stopped some of the bits of wood while the wooden block still kept moving so the bits of wood peeled off the wooden block.]]> 2019-04-03 00:11:36 UTC https://padlet.com/exco6/o7q0cuzj8t7i/wish/347872833 Pamela (6) https://padlet.com/exco6/o7q0cuzj8t7i/wish/347872919 I see:
-four different types of surfaces
-wooden block with hook
-spring balance hooked onto the wooden block
-person lifting up the spring balance when pulling instead of dragging it against the surface
-the persons hand that was pulling the wooden block was very steady
I think
-person does not drag spring balance so that the results of the amount of force needed to pull the wooden block will be accurate because the spring balance is not contributing to the amount of force needed to pull 
-person hand is  slow and steady so that the results can be taken by the teammates 

]]> 2019-04-03 00:12:02 UTC https://padlet.com/exco6/o7q0cuzj8t7i/wish/347872919 Fang Wen(32) yinyuanzheng2000 https://padlet.com/exco6/o7q0cuzj8t7i/wish/347872928 I see the wooden block being pulled across 4 different surface. Carpet, plastic, metal and sandpaper.
I see that the reading of the spring balance changed when being pulled across the surfaces.
I see that the reading of the spring balance was different when pulled across difference surfaces.
I see that the reading of the spring balance was the lowest when pulled across the metal surface but was highest when pulled across the sandpaper surface.
I see that it was hardest to drag the block across the sandpaper compared to the other 3 surfaces and it was easiest to drag across when on the metal surface.

I think it was hardest to dragster block across the sandpaper compared to the other 3 surfaces because the sandpaper was roughest out of the 4 surfaces and there was most frictional force between the surface of  the block.
I think the block was able to be dragged across the surfaces because there was more force which could overcome the frictional force.

]]> 2019-04-03 00:12:05 UTC https://padlet.com/exco6/o7q0cuzj8t7i/wish/347872928 WanYing(25) https://padlet.com/exco6/o7q0cuzj8t7i/wish/347872929 I see that the wooden block is hooked onto the spring balance and pulled across the metal,sandpaper,carpet and plastic surfaces.Pulling the wooden block across the sandpaper surface required the most force while pulling the wooden block across the metal surface required the least force.When pulling the wooden block using the spring balance,the spring balance must not be pulled along the different surfaces.
I think the spring balance must not come in contact with the different surfaces as there will also be frictional force between the surface of the spring balance and the surface it is on.This will result in the results being inaccurate.
I think the most force was needed to pull the wooden block across the sandpaper surface as the sandpaper surface was the roughest surface among the four different surfaces.This results in more force being needed to pull the wooden block across the sandpaper surface as there is more frictional force between the surface of the wooden block and the sandpaper surface,thus more force is needed to overcome the frictional force between the surface of the wooden block and the sandpaper surface.]]> 2019-04-03 00:12:05 UTC https://padlet.com/exco6/o7q0cuzj8t7i/wish/347872929 Geng Hak (37)🐉 https://padlet.com/exco6/o7q0cuzj8t7i/wish/347872951 I see:
~ The wooden block needs the most amount of force to move on the sandpaper surface.
I think:
~ That the wooden block needs the most amount of force to move on the sandpaper surface as it is the roughest surface and requires the most amount of motion force to overcome the frictional force opposing the direction of motion.]]> 2019-04-03 00:12:11 UTC https://padlet.com/exco6/o7q0cuzj8t7i/wish/347872951 Randall (34) https://padlet.com/exco6/o7q0cuzj8t7i/wish/347872959 I SEE: Someone pulling the block against a carpet surface. They pulled  the block slowly at a steady pace along the carpet. The surface of  wooden block rubbing against the carpet surface.
I THINK: That there must be more pull or push force exerted to overcome friction and allow the object to move. If you just push the object and do not apply “extra” force and allow the object to slide across the surface, there will be the same amount of frictional force between the surface of the object and the surface as the push force thus, slowing down the object.


]]> 2019-04-03 00:12:14 UTC https://padlet.com/exco6/o7q0cuzj8t7i/wish/347872959 JIE REN ( 20 ) https://padlet.com/exco6/o7q0cuzj8t7i/wish/347872961 I see that someone pulling the wooden block on a carpet surface . 
I see that the syringe is touch the carpet , hence there will be additional frictional force . That makes the result less accurate. 


]]> 2019-04-03 00:12:14 UTC https://padlet.com/exco6/o7q0cuzj8t7i/wish/347872961 Chan Man Yuk (3) https://padlet.com/exco6/o7q0cuzj8t7i/wish/347872966 I SEE: 
—one of us holding the spring balance and hooking the wooden block to it.
—one of us tries to pull the wooden block that is hooked onto the spring balance without having the spring balance dragging on the different surface.
—the wooden block is pulled on 4 different surfaces.
—the wooden is being pulled at a constant speed.
—we are observethe reading of the balance spring when it is pulling the wooden block.
—a video of the spring balance pulling the wooden block is also being recorded.
—we replay the video to check if our observation of the force measured.
—we repeated the experiment twice.


I THINK: 
-we try not to drag the spring balance on the surfaces while pulling the wooden block as it may affect our results.
-the wooden block that is pulled on the smoothest surface which is the metal, has is lesser frictional force between the. Wooden block and the metal surface. Thus, the wooden block that is placed on the metal surface   Moves across the surface the quickest.
-the wooden block that is pulled on the roughest surface which is the sandpaper, has the most frictional force between the wooden block and the sandpaper surface. Thus, the wooden block moves across the sandpaper surface the slowest ]]> 2019-04-03 00:12:14 UTC https://padlet.com/exco6/o7q0cuzj8t7i/wish/347872966 Lydia Low27 https://padlet.com/exco6/o7q0cuzj8t7i/wish/347872985 I see that a member of Rui Ting’s group is pulling on the block with a steady hand as rui ting explained what was happening when the block was being pulled.                                                                                                         I think that when the block is being pulled,there was a frictional force between the surface of the wooden block and the surface.Thus the member has the to exert more pulling force than the amount of frictional force between the wooden block and the surface for the block to move]]> 2019-04-03 00:12:20 UTC https://padlet.com/exco6/o7q0cuzj8t7i/wish/347872985 Lucas♍️⏭3️⃣0️⃣⏮ https://padlet.com/exco6/o7q0cuzj8t7i/wish/347873124 I see a person pulling the block using a spring balance and checking it’s weight (also using the spring balance) the weight shown on the spring balance is the amount of force needed to make the object move on various surfaces 
 I think that that groups results will be more accurate as they pull the block at a steady rate ▶️  The block could move as the hand pulling the block had enough energy to overcome the frictional force 
I wonder why the metal has less frictional force than plastic ]]> 2019-04-03 00:13:08 UTC https://padlet.com/exco6/o7q0cuzj8t7i/wish/347873124 Raeann c https://padlet.com/exco6/o7q0cuzj8t7i/wish/347873158 See:
  When the block was being pulled on different surfaces, the force needed is more/less.
Think:
  I think that when the block is being pulled on a rougher surface, the force needed is greater. While when the block is being pulled on a smoother surface, less force is needed. For the block to move on a rough surface, the motion force have to overcome the frictional force.
   
  
   ]]> 2019-04-03 00:13:17 UTC https://padlet.com/exco6/o7q0cuzj8t7i/wish/347873158 Xuan yi 🧟‍♂️ https://padlet.com/exco6/o7q0cuzj8t7i/wish/347873169 I see:
-the wooden block being pulled
-the wooden block is being placed on a surface
I think 🤔:
-I think that when the wooden block is being pulled on the surface,the frictional force will slow down the speed of the wooden block when the surface of the wooden block is rubbing against the surface it is on.The motion force will then overcome the frictional force.









frifrictional force]]> 2019-04-03 00:13:21 UTC https://padlet.com/exco6/o7q0cuzj8t7i/wish/347873169 LOGAN KOH🐾🐺 https://padlet.com/exco6/o7q0cuzj8t7i/wish/347873218 I see that the  motion force took to pull the wooden block is most when the block is being pulled along the surface of the sandpaper and least when the block is being pulled along the metal surface .
I think 🤔 because there are most frictional force amongst the four surfaces thus the block took the most frictional force to move]]> 2019-04-03 00:13:34 UTC https://padlet.com/exco6/o7q0cuzj8t7i/wish/347873218 Yutong https://padlet.com/exco6/o7q0cuzj8t7i/wish/347873524 -I see that the block was being pulled along on different types of surfaces.
-I see that the block moved the slowest  on the sandpaper surface .
-I see that the block moved the fastest on the metal surface .
 
~I think that there is frictional force between the block and the type of surfaces that the block was pulled on.
~I think that the sandpaper has the roughest surface so there is most amount of frictional force between the sandpaper surface and the block.
~I think that the metal has the smoothest surface so there is the least amount of frictional force between the metal surface and the block.



]]> 2019-04-03 00:14:58 UTC https://padlet.com/exco6/o7q0cuzj8t7i/wish/347873524 Lee Xin Yi (22) https://padlet.com/exco6/o7q0cuzj8t7i/wish/347873597 I see:
-that a 100g wooden block is being pulled along different surfaces.
-
I think 🤔 :
-that different surfaces require different amount of pull force to overcome different amount of frictional force.
]]> 2019-04-03 00:15:19 UTC https://padlet.com/exco6/o7q0cuzj8t7i/wish/347873597 Daniel wong(41) https://padlet.com/exco6/o7q0cuzj8t7i/wish/347874790 I see that👁
1.The block is being moved by a pull
2.The person who is pulling the block is able to overcome the frictional force between the carpet and the block
I think 💭 
1.The person who was pulling the block needed the little energy to pull the block
2.If you add a lubricant such as water, oil, etc. would affect the amount of force at which you need to overcome the amount of frictional force
I wonder 🧠
1.How can the mass of an object affect the amount of force needed to pull/push an object?
2.Why by adding lubricants to the surface would only need lesser energy to move the object?]]> 2019-04-03 00:21:21 UTC https://padlet.com/exco6/o7q0cuzj8t7i/wish/347874790 Xing Cheng (29) https://padlet.com/exco6/o7q0cuzj8t7i/wish/348464126 I see:
  1. I see that the wooden block is being hooked onto the spring balance to be weighed before the weight is taken down.
  2. I see that the wooden block is then laid down on one of the four surfaces.
  3. I see that someone drags the wooden block slowly on the surface while someone else takes a video of it.
  4. I see that the video will be deleted if it is blurry, if not, we will watch the video again to record down the measurement in grams shown on the spring balance.
  5. I see that the video is then posted onto Padlet for comments.
  6. I see that the steps are repeated again to make the results more reliable.
  7. I see that the results of the second attempt are recorded down and the average of both attempts are written in the next column.
  8. I see that the process is repeated again for another three times for the other three surfaces.
  9. I see that we answer the questions or conclusions for the experiment afterwards.
I think:
  1. I think that when the wooden block is dragged along one of the surfaces, there is frictional force between the surface and the wooden block.
  2. I think that frictional force is the force which opposes motion.
  3. I think that the types of surfaces affects the amount of frictional force between the surface and the wooden block.
  4. I think that the mass of the object affects the amount of frictional force between the surface and the object.
  5. I think that the rougher the surface the object is on, the more frictional force there is between the surface and the object.
  6. I think that the heavier the object on the surface is, the more frictional force there is between the surface and the object.
  7. I think that the smoother the surface the object is on, the less amount of frictional force there is between the surface and the object.
  8. I think that the lighter the object on the surface is, the less amount of frictional force there is between the surface and the object.
  9. I think that the sandpaper needs a greater force to pull or push the wooden block on as it is the roughest surface among all of the surfaces and thus creates a greater frictional force between the surface and the wooden block. A greater force is needed to overcome the greater frictional force between the surface and the wooden block.
  10. I think that when friction occurs between a surface and an object, heat energy is produced.
]]> 2019-04-04 11:58:41 UTC https://padlet.com/exco6/o7q0cuzj8t7i/wish/348464126 Lok Yi(9) https://padlet.com/exco6/o7q0cuzj8t7i/wish/348480917 I see...
The spring balance is hooked onto the wooden block
Somebody is dragging the spring balance, which pulls the wooden block along with it, across the carpet surface
Somebody narrating in the background about how enough motional force is needed to overcome the frictional force between the wooden block and the carpet
I think...
more effort is needed to pull the wooden block across the carpet than the plastic and metal surface because there is more frictional force between the wooden block and the carpet than the wooden block and the plastic or metal surface. Thus, more motional force is needed to overcome the frictional force between the wooden block and the carpet, making the wooden block move.]]> 2019-04-04 12:40:27 UTC https://padlet.com/exco6/o7q0cuzj8t7i/wish/348480917 Rui Ting (7) www_yahoo2 https://padlet.com/exco6/o7q0cuzj8t7i/wish/348545984 I see...
-someone pulling the spring balance
-the block has a hook that is hooked onto the spring balance
-a sandpaper,carpet,plastic and metal surface

I think...
-the spring balance is hooked onto the wooden block as they want to test of the type of surface affects the amount of force need to pull it]]> 2019-04-04 14:32:11 UTC https://padlet.com/exco6/o7q0cuzj8t7i/wish/348545984 Leonerd(23) https://padlet.com/exco6/o7q0cuzj8t7i/wish/349120269 See: I see that when the block was being pulled by the spring balance across the sandpaper surface it requires the most force.
I see that when the block was being pulled by the spring balance across the metal surface it requires the least force.
Think: I think that when the block was being pulled by the spring balance across the sand paper surface it requires the most force because the amount of frictional force was the most between the surface of the wooden block and  the surface of the sandpaper. 
I think that when the block was being pulled by the spring balance across the metal surface it requires the least force because the frictional force between the surface of the wooden block and the surface of the metal is least]]> 2019-04-06 04:47:49 UTC https://padlet.com/exco6/o7q0cuzj8t7i/wish/349120269 Kieran(24) https://padlet.com/exco6/o7q0cuzj8t7i/wish/349149421 I SEE ...
The block being pulled across the sandpaper/carpet/metal/plastic surface.
The block needing more force on different surfaces
I THINK...
That when the surface is rougher like sandpaper it has more frictional force between the block and the surface
That all kinetic energy of the moving   block due to friction force between the block and the surface is converted to all heat energy of the block rubbing against the surface
I WONDER...
What type of surface has no friction
Who discovered force
What other types of forces are th]]> 2019-04-06 13:24:23 UTC https://padlet.com/exco6/o7q0cuzj8t7i/wish/349149421