FORM: 3 SECONDARY SCHOOL - IMRIEĦEL HALF-YEARLY EXAMINATIONS 2017/2018 PHYSICS Track 3 Time: 1½ hrs Name: Class: Answer all the questions. Write down your answers in the spaces provided. The use of a calculator is allowed. Whenever necessary take g to be 10N/kg. Formulae that can be used are listed below: Density Force ρ = m V W = mg Moment = Force x perpendicular distance Pressure P = F A P = hρg Question 1 2 3 4 5 6 7 8 Mark Score Total Marks Practical Mark Final Mark 10 7 7 8 8 15 15 15 85 15 100 Physics Form 3 Secondary Track 3 2018 Page 1 of 10
SECTION A. This section carries 40marks 1. This question is about Measurements. Fill in the blanks below: a. To find the volume of alcohol, Sam poured the alcohol in a and read the volume at. [2 marks] b. To find the mass of a piece of stone, Sonia must place it on an. [1 mark] c. The mass of the stone was found to be 465g. Change 465g to kg. [1 mark] d. To finish the fun run marathon, students have 30 minutes. Change this time to seconds. [1 mark] e. A is used to measure weight. [1 mark] f. Write down the S.I. unit of Pressure. [1 mark] g. Underline the correct answer: (i) A (vector, scalar) quantity is a physical quantity having both direction and size. An example of the above is (weight, mass). [2 marks] (ii) The mass of an astronaut on earth (is the same as, is less than, is more than) his mass on the moon. [1 mark] 2. This question is about Density. A stainless steel ring of mass 15g was placed in a measuring cylinder containing some water as shown. cm 3 cm 3 a. What is the volume of water in the first cylinder? [1 mark] b. What is the volume of water and ring in the second cylinder? [1 mark] c. Calculate the volume of the ring. [1 mark] Physics Form 3 Secondary Track 3 2018 Page 2 of 10
d. Calculate the density of stainless steel. [2 marks] e. Underline the correct answer. (i) A stainless steel dish has: A (smaller, larger, same) mass A (smaller, larger, same) volume A (smaller, larger, same) density (ii) The ring sinks because: its density is (more, less) than that of water. [½ mark] [½ mark] [½ mark] [½ mark] 3. This question is about Forces At the school s sports day, two teams participated in a tug of war. Team A Team B a) Which force is exerted on the rope when it is stretched? [1 mark] b) At first as both teams start pulling, the rope stays stationary. What does this mean about the forces exerted by the teams? [1 mark] Physics Form 3 Secondary Track 3 2018 Page 3 of 10
c) Team A then exerts a force of 600N while Team B exerts a force of 450N. Calculate the Resultant Force and state the direction in which the ribbon moves. [2 marks] d) Another activity during the sports day was to race by pulling a cart. Draw and label the forces given, on the diagram below. [3 marks] Air Resistance Friction between cart and ground Weight of cart Thrust 4. This question is about Centre of Gravity and Weight Jamie went for a morning bicycle ride. Jamie s mass is 65 kg while the bicycle s mass is 15 kg. a) Calculate the total weight of Jamie and his bicycle. [2 marks] Physics Form 3 Secondary Track 3 2018 Page 4 of 10
b) Complete: Weight is the force caused by [1 mark] c) On the diagram, mark with an X where the Centre of Gravity acts on Jamie and his bicycle. [1 mark] d) Circle the names of the diagrams below which are most stable. [2 marks] Vase Ballerina Funnel top Chair Car e) Using the diagrams above, mention 2 ways how the stability of an object can be improved. [2 marks] 5. This question is about Moments A student was varying the force acting on a spanner and calculating the turning effect on the nut. Below is the table of results: Moment of the Force(Nm) 0 1 2 3 4 5 Force (N) 0 5 10 15 20 25 a) Mark the pivot (or fulcrum) on the diagram with an X. [1 mark] Physics Form 3 Secondary Track 3 2018 Page 5 of 10
b) Look at the diagram and convert the length of the spanner in metres? [1 mark] c) On the graph paper provided, plot a graph of Moments, on the y-axis, against Force applied, on the x-axis. [5 marks] d) From the graph, what can you conclude about the relationship between the Force applied and the Moment of the force? [1 mark] SECTION B. This section carries 45marks 6. This question is about Pressure a) Define Pressure. [2 marks] b) A block of iron of sides 45cm, 15cm and 20cm rests on a sandy beach as shown. Physics Form 3 Secondary Track 3 2018 Page 6 of 10
(i) (ii) Calculate the volume of the block. [2 marks] If the block has a density of 7g/cm 3, calculate its mass in kg. [3 marks] (iii) Work out the downward force exerted on the sand. [2 marks] (iv) Colour the side that exerts the highest pressure on the sand. Give a reason for your answer. [2 marks] (v) Calculate the smallest pressure exerted on the sand. [4 marks] 7. This question is about Moments Garfield of mass 15kg and Odie of mass 12kg are playing on a seesaw. Physics Form 3 Secondary Track 3 2018 Page 7 of 10
a) Calculate Garfield s AND Odie s Weights. Garfield s weight Odie s weight [2 marks] b) Who is making a Clockwise Moment? [½ mark] c) Who is making an Anticlockwise Moment? [½ mark] d) Calculate the Clockwise Moment AND the Anticlockwise Moment Clockwise Moment Anticlockwise Moment [3 marks] e) State the Principle of Moments [2 marks] f) Is the seesaw in equilibrium? If not, in which direction will it topple? [2 marks] g) Give a solution for Garfield and Odie to make the seesaw balance. [1 mark] Physics Form 3 Secondary Track 3 2018 Page 8 of 10
h) If a dish of lasagne is placed on Garfield s side at a distance of 0.8m from the pivot, calculate the Lasagne s Weight. [4 marks] 8. This question is about Hooke s Law Abigail investigates how the spring from a trampoline behaves. She performs an experiment to investigate Hooke s Law. a) State Hooke s Law. [1 mark] b) On the next page, draw a diagram of the setup needed and write down the method Abigail needs to follow. Physics Form 3 Secondary Track 3 2018 Page 9 of 10
Diagram: [4 marks] Method: [3 marks] c) Abigail obtains the following results: Force (N) 0 1 2 3 4 5 Length of Spring (mm) 42 48 66 72 Extension (mm) 6 12 18 24 a) Fill in the missing values in the table above. [4 marks] b) What is the original length of the spring? [1 mark] c) From the values in the table, does the spring obeys Hooke s law? [1 mark] d) Abigail decides to continue loading more weights to the spring. What would happen to the spring? [1 mark] Physics Form 3 Secondary Track 3 2018 Page 10 of 10