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1 MARIA REGINA COLLEGE PHYSICS Creative, Innovative, Professional HALF YEARLY EXAMINATION 2017 YEAR: 9 TRACK / LEVEL: 3 TIME: 1 hr 30 mins NAME: CLASS: Answer ALL questions in the spaces provided on the exam paper. All working must be shown. The use of a calculator is allowed. Where necessary take the acceleration due to gravity, g = 10 m/s 2. Forces Density W = mg ρ = V m Pressure P = A F P = h ρ g Moments Moment = Force x perpendicular distance Area of rectangle/square: L x B Others Volume of cuboid/cube: L x B x H For examiner s use: Number Total Maximum mark Actual mark Actual Mark Total Theory Total Practical Final Mark Maximum Mark Physics Half yearly exam 2017 Track 3 - Form 3 Page 1 of 10
2 SECTION A This section carries 40 marks. 1. This question is about mass and forces. a) State whether the correct answer is mass or weight. The first one is done for you. i It is measured in kilograms. mass ii iii iv Depends on the force of gravity. It is a vector quantity. It is the amount of matter in an object. [3] b) A man tries to move a wooden box by pulling it as shown in Figure 1: Figure 1 i) Draw on Figure 1: an arrow to show the direction in which friction acts. Label it with a letter F. [1] an arrow to show the reaction of the ground on the box. Label it with a letter R. [1] ii) Underline the correct answer: If a heavy object is placed inside the box, the friction between the ground and the box (decreases, remains the same, increases). [1] iii) Given that the box has a mass of 10 kg while the object inside has a mass of 16 kg, calculate the total weight in N. Physics Half yearly exam 2017 Track 3 - Form 3 Page 2 of 10
3 2. This question is about pressure in liquids. Four divers are diving as shown in Figure 2. Figure 2 a) Which diver experiences the greatest water pressure? Why? b) Which divers experience the same water pressure? Why? c) Diver C is at a depth of 5 m. Given that the density of water is 1025 kg/m 3, calculate the water pressure acting at that depth. d) The atmospheric pressure is 101 kpa. Change this value to Pa. e) Calculate the total pressure acting on diver C. Physics Half yearly exam 2017 Track 3 - Form 3 Page 3 of 10
4 3. This question is about density. Nicole needs to find the density of a pebble she found on the beach. a) State the name of the apparatus she uses to find its mass. Then she fills the instrument in Figure 3 with water and gently immerses the pebble. Figure 3 b) Name the instrument she uses to find the volume of the pebble. c) Calculate the volume of the pebble. d) Given that the pebble has a mass of 24 g, calculate its density. e) State two precautions she takes while measuring the volume. f) Explain why the pebble sinks in water. Physics Half yearly exam 2017 Track 3 - Form 3 Page 4 of 10
5 4. This question is about hydraulic machines. The hydraulic jack shown in Figure 4 is an example of a hydraulic machine. a) State the advantage of using hydraulic machines. A force F applied at piston L just balances the weight of an object placed on piston K. F Figure 4 b) Calculate the pressure exerted on piston K. Give your answer in N/cm 2. c) What is the value of the pressure exerted throughout the liquid? d) Calculate the value of force F. e) The area of piston K is increased while everything else is unchanged. Would a smaller or larger force F be required to lift the object? f) Why are liquids and not gases used in hydraulic machines? g) Give another example of a hydraulic machine. Physics Half yearly exam 2017 Track 3 - Form 3 Page 5 of 10
6 5. This question is about stretching springs. a) Elisa was carrying out an experiment to prove Hooke s law. She was provided with a spring, a stand with a clamp, a number of weights, a hanger, a pointer and a metre ruler. Draw and label the missing apparatus in Figure 5. b) She obtains the results shown below. Figure 5 [3] i) Explain why the spring obeys Hooke s law. ii) Before adding weights, the spring was 16 mm long. Work out the total length of the spring when the load added was 3 N. iii) Elisa repeats the experiment with a stiffer spring. Sketch on the same axes the graph she obtains. [1] Physics Half yearly exam 2017 Track 3 - Form 3 Page 6 of 10
7 SECTION B This section carries 45 marks. 6. a) State the principle of moments. b) A box having a weight of 50 N is placed on a wooden bar which is pivoted at its midpoint as shown in Figure 6. It is moved several times away from the pivot. Each time the force in the spring changes as shown in the table. box pivot spring (fixed) Figure 6 Distance d 1 (cm) Force in spring (N) i) Plot a graph of Force in the spring (N) on y-axis against distance d 1 (cm) on x-axis. [5] ii) When the box is placed 18 cm from the pivot, the force in the spring = N [1] iii) Calculate the moment produced by the box when placed 18 cm away from the pivot. c) i) The uniform wooden bar in Figure 7 is pivoted at its midpoint. Show through calculation that distance d has to be 0.25 m for the system to be balanced. 0.3 m 0.1 m d Figure 7 10 N 20 N 36 N [4] ii) Calculate the value of the reaction at the pivot. Physics Half yearly exam 2017 Track 3 - Form 3 Page 7 of 10
8 Physics Half yearly exam 2017 Track 3 - Form 3 Page 8 of 10
![7. a) A sealed glass container has the dimensions shown below. It is filled with air. i) Explain how the air particles exert a pressure. [2] ii) Calculate the volume of air inside the container.](/docs-images/74/71355297/images/9-1.jpg "[2] Figure 8 iii) Given that air has a density of 0.0011 g/cm 3, calculate the mass of air inside the container. iv) Some of the air particles are removed from the container.")
9 7. a) A sealed glass container has the dimensions shown below. It is filled with air. i) Explain how the air particles exert a pressure. [2] ii) Calculate the volume of air inside the container. [2] Figure 8 iii) Given that air has a density of g/cm 3, calculate the mass of air inside the container. iv) Some of the air particles are removed from the container. Does the pressure increase, remain the same or decrease? Explain. v) Given that the air inside is heated instead and that the size of the container does not change, does the pressure increase, remain the same or decrease? Explain. b) Nigel needs to find the density of apple juice. i) Describe briefly how he does this. Name also the apparatus he has to use. [4] ii) Equation to be used: [1] Physics Half yearly exam 2017 Track 3 - Form 3 Page 9 of 10
10 8. a) Define the term pressure. b) The table in Figure 9 has a weight of 80 N. Each of its four legs in contact with the floor has an area of 5 cm 2. Figure 9 i) Calculate the total area (in cm 2 ) in contact with the floor. [1] ii) Calculate the total pressure (in N/cm 2 ) acting on the floor. iii) Calculate the total pressure (in Pa) acting on the floor. iv) A fish bowl is placed on the table. How does the pressure change? Explain. c) Walking in stiletto heels on a wooden floor is not recommended. Explain why. [3] d) Explain why snow shoes help to walk on snow. [3] END OF PAPER Physics Half yearly exam 2017 Track 3 - Form 3 Page 10 of 10
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