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1.Get into groups of 4

2.Number yourselves from 1 to 4

3.Each of you will take 1 case study from page 24-25 of the activity book. The appropriate links and resources are placed on padlet and you can feel free to google more.

4.If you have time you can look at the other links.

Please key in your answers to Q 1 and Q2 in 2 separate posts and title your post with the question number and your name

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Runway Heels: World's First Retractable High Heels

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3-in-1 Suction Cup Phone Mount by Armor All

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https://www.youtube.com/watch?v=yrWqWEtSe2Q

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How do straws work? | #aumsum #kids #science #education #children

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https://www.explainthatstuff.com/submarines.html

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A simple look at submarines, what they are, and how they work.

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the air pressure within the suction cup is alot lower than outside the suction cup

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1) When the patient drinks from the straw, the air will first be sucked making the air pressure in the straw decrease. Therefore the air pressure present on the liquid of the glass will help push the liquid up the straw.

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the texture of the surface, the weight of the phone.

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1)the area of contact between the straw and the mouth is smaller, thus pressure exerted on the straw is higher

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1. when the patient sucks in the air using the straw to allow water to flow in, the air pressure in the straw decreases

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1. water is heavier compared to air. The deeper the submarines go, the higher the force hence, the pressure exerted on the submarine is higher.
2. it has to be thick, waterproof and strong

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2)Since there is a hole above the liquid level of the straw, the air pressure will not decrease no matter how much air that leaves the straw since the hole will allow more air to enter. Therefore the patient isnt able to drink their liquid.

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1. air pressure pushes down on the liquid in thr cup. when we inhale to drink, only the liquid in the straw will go upwards as the air pressure in the straw decreases
2. the hole allows air pressure to continuously enter the straw and the air pressure will not decrease and so no water can enter the straw??

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1) the air pressure within the suction cup is lower and on the outside is higher.
2)the surface has to be clean so its smooth and able to stick,the suction cup has to be curved so that it can compress the air

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2. as air is constanly entering the straw through the hole and therefore water cannot enter the straw.

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The hull of a submarine must be able to withstand the forces created by the outside water pressure being greater than the inside air pressure. The outside water pressure increases with depth and so the stresses on the hull also increase with depth.

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After inhaling the air present in the straw, this causes the air pressure to decrease. The air pressure present on the liquid of the glass pushes the liquid into the straw, causing the water to move upwards.

The hole is prevents the liquid from moving upwards as the air or water escapes through that hole.

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keira toh( in fayth,jamie and avril group)

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keira toh( in fayth,jamie and avril group)

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1.The hull of a submarine must be able to withstand the forces created by the outside water pressure being greater than the inside air pressure. The outside water pressure increases with depth and so the stresses on the hull also increase with depth.
2. some physical properties is that the outer hull must be waterproof, which is usually made of metal

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the hole allows more air to escape thus water cannot go in his mouth even though alot of force is used

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1. pressure is increased because more force is needed to suck in the water from the valve into the chamber and into the patient's mouth

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1. water has a higher force compared to air. The deeper the submarines go, the higher the force therefore the pressure exerted on the submarine is higher.

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the pressure in the suction cup is lower than the outside of the suction cup allowing the cup to stick on the car glass without falling

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2.  It must be hard, waterproof, resistant and strong

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2. air keeps entering through the hole so water cannot enter the straw

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air pressure inside cup is lower than outside of cup

if the surface is dry or wet, weight of phone

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1a) area of contact and force
1c) the area of contact between the toes and the high-heeled shoe is smaller, so pressure exerted on the foot is greatest.
2) If your feet are tired from the high-heeled shoes, you are able to retract the heel and use the shoe as a flat-heeled shoe.

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1) the air within the suction cup is lower compared to outside.

2) the type of surface ,weight and length of phone

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1. the pressure outside the cup is greater than the lower pressure inside the cup causing suction
2. surface area needs to be smooth

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The pressure on the inside of the suction cup is a lot lower than the air pressure outside the suction cup, causing it to stick to a surface.

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a .the area of contact and weight
c)  the area of contact between the toes and the ground decreases with causes more pressure to be exerted

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The shape and texture of the suction cup affects its ability to stick

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When a patient uses a straw to drink , they inhale the air in the straw causing less air pressure in the straw. Thus ,the air pressure on the liquid to push it in the straw allowing the patient to drink

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Q1.Oceans are most turbulent where wind meets water: on their surface. It's dark and difficult to see, there's no air to breathe, and intense water pressure makes people uncomfortable and claustrophobic. Submarines are designed to carry people safely through this very harsh environment.
q2 . the outer wall should be heavier and the area of contact must be lower

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1a) area of contact and force
1b) drawn in the book
1c) the heel. the area of contact between heel and surface is smaller compared to the front. therefore the pressure exerted is higher. the weight remains constant
2) a flat surface means the same pressure everywhere, so feet won't be as tired and not exerted

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1. the metal of the submaarine can only withstand a certain amount of pressure before it buckles or collapses. if that happens, the people in the submarine will die due to the high pressure.

2. it should be thick so it can withstand the high pressure underwater.

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1)the air pressure inside the suction cup is higher than the air pressure outside the suction cup.
2)the material of the suction cup.he surface of the suction cup should be clean and the cup should be rounded to ensure that it would stick.

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if your feet hurt from standing too long or get tired you can make it a flat shoe which will make it not so painful

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qn one:
generally water is much more heavier than air. the deeper the submarines go underwater, the more the pressure exerted on them. submarines are built in such a way that they are able to hold off forces using the outer and inner walls. this helps the submarines to stay upright and stable despite harsh pressure levels at times.

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qn two:
waterproof and strong? can't think of more properties sorry

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2) The hole in the straw above the liquid level allows air to escape, thus there is no air pressure in the straw to push the liquid up .

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1a) Area of contact force and force
1b) The toe area
1c) The area of contact between the toe and the shoe is smaller so pressure exerts on the toes greatest.
2) It helps our feet be lesser painful after being in heels for a long time.

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1a) The area of contact between 2 surfaces and the force applied.
1c) When you are tip-toeing, the weight is all front part of the foot. Although the back of the heel has a much smaller area of contact, when you are wearing high-heeled shoes, you will land on your toes first which causes all the weight and pressure to transfer to the toes.
2) Pressure = Force/Area. When you where high-heeled shoes, although the force applied is constant, the area of contact between the floor and the sole of the shoe decreases. Thus, the pressure exerted on the sole on the shoe increases. Therefore, after wearing them for some time, your feet will start to feel pain. Hence, you will feel like changing to a flat-heeled shoe, which although the force applied is constant, the area of contact between the sole of the shoe and the floor increases. Thus, the pressure exerted on the shoe decreases, causing the feet to feel less painful. This helps as it will be more convenient than compared to worrying about having to bring two shoes along.

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1a) The area of contact with the ground and the weight of the object.
1c)As the pressure of the of the shoe is being pushed forward so the pressure is getting exerted the most around the front of the feet.
2)It helps, as when the high heels feel uncomfortable you can press a button and turn them into flat-heeled shoes. Because of that, it reduces the chances of people getting knee problems or lower back pain as they can convert it into a more comfortable shoe anytime.

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1a)Force,Area
c)The toe has a greater area of contact than the heel of the leg.Hence there's more force exerted on the heel of the foot.Hence the heel of the leg would face the most pain.
2.So when the user of the product faces some pain they can easily remove the heel and turn it into flats which will reduce the pain and also reduce the probability of health problems like back pain and knee pain.

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dharshini E                                                        (myself, daniella, maya, esther)

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dharshini E                                                        (myself, daniella, maya, esther)

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Q1) A low pressure region is created inside the suction area. It's actualy the atmospheric pressure outside the cup, pressing down on the low pressure area inside the cup, that creates the suction.

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1. a submarine can float when the mass of water that displaces is equal to the mass of the submarine. this displaced water cause an upward force called buoyancy.
2. the outer should be waterproof, strong and hard.