Science Form 1, 2 & 3 Notes
Question 1:Figure 1 shows a lever system in equilibrium. Calculate the weight of X. Answer:20 N Question 2:Figure 2 shows a cuboid with a weight of 5 N.(a) Which surface will exert the greatest pressure?(b) Calculate the pressure exerted by each surface. Answer:(a) Surface C(b) Pressure A = 0.03 N cm–2/ 333 N m–2Pressure B … Read more
Activity 8.11:Aim: To study the effect of depth on pressure in liquids.Material: WaterApparatus: 50 cm rubber tube, basin and 1 000 ml measuring cylinderInstruction1. Fill a measuring cylinder to the maximum volume and turn it upside down as shown in Figure 8.47.2. Put one end of a rubber tube into the measuring cylinder.3. Blow air … Read more
Activity 8.10:Aim: To show the existence of atmospheric pressure in daily life.Materials: Water and shredded paperApparatus: Plunger, Magdeburg hemisphere, straw, syringe, vacuum cleaner, beaker, drinking glass, rubber tube, tiles and basinInstructionQuestion 1:Wet the rim of a plunger with water. Press the plunger against a piece of tile so that air in the plunger is displaced … Read more
Activity 8.9:Aim: To study the factors that affect gas pressure.Material: WaterApparatus: Bourdon gauge, 250 ml beaker, Bunsen burner, tripod stand, retort stand with clamp, wire gauze, wooden block, thermometer, rubber tube, stirrer, round-bottom flask and syringe(A) VolumeInstruction1. Set up the apparatus as shown in Figure 8.35.2. Push the piston into the syringe. Observe the change … Read more
Activity 8.8:Aim: To show that air exerts pressure.Instruction1. Fill a glass with water until it is full.2. Cover the mouth of the glass with a card.3. Hold the card and turn the glass upside down quickly.4. Remove your hand slowly. Observe if the water flows out (Figure 8.34).QuestionWhy doesn’t the water flow out when the … Read more
Experiment 8.2:Aim: To study the relationship between surface area and pressure.Problem statement: What is the effect of surface area on pressure produced by the same force?Hypothesis: The larger the surface area, the lower the pressure exerted.Variables:(a) Constant variable: Metal blocks of the same mass(b) Manipulated variable: Surface area(c) Responding variable: Depth of dentMaterials: Metal block … Read more
Activity 8.6:Aim: To study the relationship between moment of force, effort and perpendicular distance from pivot to force.Materials: Nut and screwApparatus: SpannerInstruction1. Prepare an item that is fitted with a nut and screw.2. Hold a spanner in position X as shown in Figure 8.25 and tighten the nut. Then, hold the spanner in position Y … Read more
Experiment 8.1:Aim: To study the effect of density on the position of an object in water.Problem statement: Will an object that is more dense than water submerge or float in water?Hypothesis: An object that is more dense than water will submerge, while an object that is less dense than water will float.Variables:(a) Constant variable: Volume … Read more
Activity 8.4:Aim: To determine buoyant force.Materials: Glass bottle lid, rubber stopper, squash ball, plasticine and stringApparatus: 250 ml beaker and spring balanceInstruction1. Hang a glass bottle lid at the end of a spring balance as shown in Photograph 8.7 (a).2. Record the actual weight of the glass bottle lid, W1.3. Fill 250 ml of water … Read more
Question 1:Name the force acting in each of the following situations (Photograph 1). Answer:(a) Gravitational force(b) Frictional force(c) Buoyant force Question 2:Photograph 2 shows a man pushing a car. Show the direction of the pushing force and point of application of force on the photograph. Answer: Question 3:Photograph 3 shows a football being kicked by … Read more