KULLEGG MARIA REGINA BOYS SECONDARY MOSTA HALF-YEARLY EXAMINATIONS 2012/2013. SUBJECT: PHYSICS Form 3 TIME: 1 HR 30 MIN NAME :
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1 KULLEGG MARIA REGINA BOYS SECONDARY MOSTA HALF-YEARLY EXAMINATIONS 2012/2013 SUBJECT: PHYSICS Form 3 TIME: 1 HR 30 MIN NAME : CLASS: INDEX NO : Track 2 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 2013 Track 2 - Form 3 Page 1 of 10
![0 0 1 2 3 0 1 2 3 (i) cm (ii) cm [2] b) Jean Claude has the following measuring instruments: thermometer metre](/docs-images/77/76265539/images/2-2.jpg "rule measuring cylinder stopwatch top pan balance spring balance Which of the following measuring instruments")
2 SECTION A This section carries 40 marks. 1. This question is about scales and measuring instruments. a) Use the scale to read the length of each object (i) cm (ii) cm [2] b) Jean Claude has the following measuring instruments: thermometer metre rule measuring cylinder stopwatch top pan balance spring balance Which of the following measuring instruments would you use to measure the: (i) mass of an empty beaker. (ii) length of a tennis racket. (iii) friction acting on a wooden block. (iv) temperature of a hot liquid. (v) time taken to run 100 m. (vi) volume of water in a container. [6] Physics Half yearly exam 2013 Track 2 - Form 3 Page 2 of 10
3 2. This question is about pressure in gases. Figure 1 shows air particles moving in a closed container. air particles container Underline the correct answer: Figure 1 a) The air particles move in (different directions, one direction). [1] b) At room temperature they move very (slow, fast). [1] c) If the container is heated, the particles move at (lower, higher) speeds. [1] d) If the same number of particles are placed in a smaller container they hit the e) inside of the container (more, less) often. [1] e) If some particles are removed from the container, the particles collide e) (more, less) often. [1] f) In which case (c, d or e) will the pressure decrease? Explain. [3] 3. This question is about scalar and vector quantities. a) Physical quantities can be either scalars or vectors. (i) A scalar quantity has only. [1] (ii) A vector quantity has both and. [2] b) The following are six physical quantities: mass velocity time weight density friction (i) Which three of them are scalars? [3] (ii) Which two of them are forces? [2] Physics Half yearly exam 2013 Track 2 - Form 3 Page 3 of 10
4 4. This question is about density. a) Density is the mass per unit. [1] b) Andrea wants to know if apples and pears float or sink in water. He measures the mass and the volume of an apple and a pear. Mass (g) Volume (cm 3 ) Apple Pear (i) Using the values in the table, work out the density of each fruit in g/cm 3. Apple [1] Pear [1] (ii) Water has a density of 1 g/cm 3. When he places the apple and the pear in a sink filled with water, he notices that only the floats because its density is than that of water. [2] c) Andrea finds five iron nails of different size. Underline the correct answer. The iron nails have : (i) (the same, a different) mass. [1] (ii) (the same, a different) volume. [1] (iii) (the same, a different) density. [1] Physics Half yearly exam 2013 Track 2 - Form 3 Page 4 of 10
![P Q R (iv) P Q R hammer plate [4] c) Figure 2 shows the apparatus used to find the centre of gravity of an irregular flat shape. List in order (e.g. 1, 2, 3 and 4) the steps to find the centre of gravity of the irregular flat shape.](/docs-images/77/76265539/images/5-1.jpg "The first one is done for A irregular flat shape Figure 1 B C clamped nail string with mass you. stand Figure 2 This is repeated for holes B and C.")
5 5. This question is about the centre of gravity. a) The centre of gravity of an object is the point where the of an object seems to act. [1] b) Circle ONE of the letters P, Q or R showing the correct position of the centre of gravity of each object: P Q R P Q R (i) (ii) mirror guitar (iii) P Q R (iv) P Q R hammer plate [4] c) Figure 2 shows the apparatus used to find the centre of gravity of an irregular flat shape. List in order (e.g. 1, 2, 3 and 4) the steps to find the centre of gravity of the irregular flat shape. The first one is done for A irregular flat shape Figure 1 B C clamped nail string with mass you. stand Figure 2 This is repeated for holes B and C. Three holes A, B and C are punched in the flat shape. A string with a mass is suspended from the nail and its position is noted. The shape is suspended freely from hole A using a clamped nail. Physics Half yearly exam 2013 Track 2 - Form 3 Page 5 of 10 1 [3]
6 SECTION B This section carries 45 marks. 6. This question is about Hooke s law. a) Fill in : Robert Hooke ( ) Hooke s law states that the is directly proportional to the unless the elastic limit is exceeded. [2] b) Label the following setup used to investigate Hooke s law. [5] c) After carrying out the investigation, the following results are obtained: Load (N) Length of spring (mm) Extension (i) The length of the unloaded spring is mm. [1] (ii) Complete the missing values by calculating the extension in each case. [2] (iii) Continue plotting the graph of Extension (mm) on the y-axis against Load (N) on the axis. Write the title of the graph and label each axis. [5] Physics Half yearly exam 2013 Track 2 - Form 3 Page 6 of 10
7 Title: A graph of (mm) against (N) y - axis 0 x - axis Physics Half yearly exam 2013 Track 2 - Form 3 Page 7 of 10
![[2] (iv) Ryan then stands on one leg with Isaac still on his shoulders. Underline the correct words: Their weight (remains the same, increases, decreases).](/docs-images/77/76265539/images/8-1.jpg "The area in contact with the ground (remains the same, increases, decreases). The pressure exerted on the ground (remains the same, increases, decreases).[3] b) Ryan s favourite hobby is scuba diving.")
8 7. This question is about pressure. a) Ryan is lifting his younger brother Isaac on his shoulders. Ryan has a mass of 60 kg while Isaac has a mass of 30 kg. Isaac Ryan (i) Calculate their total mass. [1] (ii) Calculate their total weight in Newtons. [2] (iii) The total area of contact of Ryan s shoes while standing on both legs is 360 cm 2. Calculate the total pressure on the ground in N/cm 2. [2] (iv) Ryan then stands on one leg with Isaac still on his shoulders. Underline the correct words: Their weight (remains the same, increases, decreases). The area in contact with the ground (remains the same, increases, decreases). The pressure exerted on the ground (remains the same, increases, decreases).[3] b) Ryan s favourite hobby is scuba diving. Pressure in liquids is calculated by: P = h ρ g (i) What do the following symbols mean? h = ρ = g = [3] (ii) If the density of sea water is 1050 kg/m 3, calculate the pressure caused by sea water on Ryan at a depth of 14 m. [2] (iii) What happens to the pressure on Ryan when he starts to rise to the surface? [2] Physics Half yearly exam 2013 Track 2 - Form 3 Page 8 of 10
9 8. This question is about moments. a) Fill in the law of moments. When an object is (in equilibrium), the sum of the is equal to the sum of the. [3] b) Nicole is playing with her friend Stephanie on a see-saw. 1.2 m 1.0 m Nicole Stephanie W 600 N (i) Calculate Stephanie s moment. [2] (ii) What is Nicole s moment if the see-saw is balanced? [1] (iii) Calculate Nicole s weight. [2] (iv) What happens if Nicole moves towards the pivot? [2] Physics Half yearly exam 2013 Track 2 - Form 3 Page 9 of 10
10 c) Andrew needs to loosen a nut by using a spanner. 11 N nut spanner 0.25 m (i) Calculate the resulting moment in Nm. [2] (ii) State the direction of the moment. [1] (iii) The nut did not become loose with the moment applied. Give two ways how Andrew could increase the moment. [2] END OF PAPER Physics Half yearly exam 2013 Track 2 - Form 3 Page 10 of 10
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