# 3.4 Applying Pascals Principle

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27-Jun-2015

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• 1. Learning Objective: 3.4 Applying Pascals PrincipleMethod: Inquiry-DiscoveryApproach: Set InductionActivity: Hands-on (predict, observe , explain)List of material/apparatus: Toothpaste, plastic bag, simple hydraulic systemActivity 1 1. How do you push the toothpaste out from the toothpastetube? Activity 2 1. Perforate a plastic bag with a needle 2. Fill in water into the plastic bag 3. Press the plastic bagIdea: Pressure exerted on an enclosed liquid is transmitted equally to every part of the liquid. Activity 31. Each table is equipped with a simple hydraulic system as shown on the diagrambelow. 1

2. 2. Students are asked to observe piston B when piston A is pressed.3. Student presses Piston A.4. Students are asked to explain their observation. Activity 4 1. Student now presses both Piston A and Piston B so that both are in equilibrium.2. Students are asked about the piston that requires a larger force.3. Students are asked about pressures acting on both pistons.4. Students are asked to relate the pressure, P1, on piston A in terms of force, F1 andarea, A15. Students are asked to relate the pressure, P2, on piston B in terms of force, F2 andarea, A26. Students are asked to derive a relationship between F1, F2, A1, and A2. Summative Test Questions1. The pressure applied to an enclosed liquid is .. transmitted to all partsof the liquid.2. Why does the presence of air bubbles in hydraulic brake system will cause thesystem to be less efficient? 2 3. 3. The figure below shows a model of a simple hydraulic system.The cross-sectional area of piston X is 0.03 m2 and the cross-sectional area ofpiston Y is 0.90 m2. Calculate the weight of object P?3