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Exam Tips: Solving projectile motion

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Projectile motion question is always one of the hard question to score. Reason is mainly due to weak foundation in kinematics. There are only two different cases that question can base on., i.e. case with constant velocity and case with constant acceleration. Projectile motion involves the two cases in one single question, whereby vertical component of the projectile is a case of constant acceleration, and horizontal component is a case of constant velocity. Reason being, there is only one force acting, i.e. the gravity in the vertical direction. Let's look at one example question and the suggested steps of solution: Example question: 9702/21/M/J/2016 Question 2(b) A ball is thrown from a point P with an initial velocity u of 12 m s -1  at 50° to the horizontal, as illustrated in Fig. 2.1. The ball reaches maximum height at Q. Air resistance is negligible. Show that the maximum height reached by the ball is 4.3 m. Steps of solution: 1. Decide component to be used:
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Exam Tips: Comparison between two quantities

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Comparison question is a popular type of question. It often requires good mathematically skills and clear presentation of the steps of solution. You might be able to work out the answer very quickly in your mind, base on logical sense and strong foundation of mathematics. However, a clear and organised presentation is very important for you to get optimum marks if your final answer is incorrect due to wrong calculation. In this post, I suggest a structured problem solving technique that you can learn to apply if you have not had one. Once you have got used to the method, you will be able to simplify the steps into just a few lines. Example question: 9702/22/M/J/2016 Question 3(b) The Young modulus of steel is 1.9 × 10 11  Pa. The Young modulus of copper is 1.2 × 10 11 Pa. A steel wire and a copper wire each have the same cross-sectional area and length. The two wires are each extended by equal forces. (i) Use the definition of the Young modulus to determine the ratio      exten
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