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3.3 Understanding Pressure And Atmospheric Pressure

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• 1. Problem/challenge/misconception: Atmospheric pressure is caused by the collision of air molecules on the surface Hands-On Activity to conceptualise atmospheric pressure. Topic: Understanding atmospheric pressure. Approach: Active Learning Method: Hands-On Activity Implementing strategy: a. Six activity stations are prepared around the laboratory. b. Students are divided into six groups to conduct the activities in rotation. c. Worksheet is provided at each station. d. Teacher discusses the results of the Hands-On Activity with the students. e. Teacher demonstrates an activity on the concept of atmospheric pressure followed by discussion. (Optional) Station 1: Spiderman Station 2: Breaking of metre rule using newspaper Station 3: Anti-gravity water Station 4: Shelled boiled egg in conical flask Station 5: Crumpled plastic mineral water Station 6: Drinking of carbonated beverage Demonstration: Crumpled tin can
• 2. Worksheet for Station 1 Apparatus: Suction pump (suction cap) Instruction: Press the suction cap onto a smooth surface. Questions: 1. What do you observe? 2. What happen to the air in the suction pump when you press it? 3. Compare the pressure between the air in the suction pump and the surrounding.
• 3. Worksheet for Station 2 Apparatus: Metre rule Material: Newspaper Instruction: 1. Spread a small sheet of newspaper on the table. 2. Place a half-metre rule underneath the newspaper with part of it jutting out as shown in the figure below. 3. Try to lift the newspaper by chopping the ruler at point A with your fist. 4. Repeat the activity with a bigger sheet of newspaper. Metre rule Newspaper A Questions: 1. Which sheet of newspaper is more difficult to lift? 2. Explain your answer.
• 4. Worksheet for Station 3 Apparatus: A drinking glass, a square shaped cardboard (5 cm x 5 cm) Material: Tap water. Instruction: 1. Fill in the glass to the brim with tap water. 2. Cover the glass with a cardboard. 3. Press the cardboard firmly and turn the glass upside down. 4. Release your hand from the cardboard when the glass is fully inverted. Question: 1. What happens to the water when the glass is fully inverted? 2. What causes the phenomenon that has been observed? 3. What happen if the same experiment is performed on the Moon?