Though the graph is a height-time graph, it is similar to a distance-time graph. Questions: 2017PPp1q3 and 2020PPp1q5 Answer: Option D

Instead of the usual ball release from rest, this question states that the ball has an initial velocity greater than terminal velocity in the air. There are a few scenarios which are possible. object moving in vacuum at high speed entering air (e.g. meteor entering Earth's atmosphere) object is thrown down from a high altitude at high speed parachute is opened and the speed decreases till terminal velocity stone falling with high speed in air hits the water and speed decreases etc View the video for the explanation. Question : 2024PPp1q6 Answer: Option A

Instead of the usual vector diagram involving forces, these questions involve speed in a specific direction, which is velocity. Velocity is a vector quantity , which has both magnitude and direction . Hence we can apply the vector diagram (parallelogram method or tip-to-tail method) to these questions. Question 01 Answer: Option A Question 02: 2012P1Q2 Answer: Option A Question 03: 2021PPp1Q1 Answer: Option C Similar type of questions: https://www.sgphysicstuition.com/post/video-01-how-to-find-resultant-force-of-two-or-three-forces-without-drawing-vector-diagram https://www.sgphysicstuition.com/post/video-02-finding-resultant-force-from-vector-diagram-provided

This question is challenging to students as there are many information given. But it is actually quite straight forward when you save one thing at a time. In this question, it is given that speed doubles, air resistance increases by four times. The actual relationship is speed is directly proportional to speed^2. This question can be more challenging if this is given instead or that a random other speed is given. Watch the second part of the video to understand this deeper, especially for Pure Physics students. What the video tutorial. Question: 2023SPp1q3 Answer: Option A

Answer: Option B Similar questions https://www.sgphysicstuition.com/post/video-01-how-to-find-resultant-force-of-two-or-three-forces-without-drawing-vector-diagram https://www.sgphysicstuition.com/post/video-02-finding-resultant-force-from-vector-diagram-provided https://www.sgphysicstuition.com/post/finding-resultant-velocity-on-boat-or-plane-with-wind

Internal energy of a substance is the sum of kinetic energy and  potential energy of the molecules. kinetic energy  is directly proportional to the temperture of the substance potential energy  is related to the average spacing between the molecules (PE increases as spacing increases) - (for O-level, we can simplify it and treat it as PE will only change when there is a change of state . E.g during melting, the intermolecular forces are overcome and molcules are further now, hence PE increases. During melting, temp remains constant, hence KE remains the same) - i.e at any time, there is only either KE or PE change during the heating or cooling curve. As the substance is heated : energy is transferred into the internal store of the substance. internal energy increases . As the substance is cooled : energy is transferred out  of the internal store of the substance. internal energy decreases .

In the syllabus, we are required to understand the orders of magntiude of various objects. Though we may no need to memorise the exact values, the rough range and orders of magnitude of sizes are important. I will show some examples of the past years questions so have a better idea how to solve them. You can view the video for the explanation and sample questions with answers. Below are the sample questions from past years. 2024NAp1q2 Answer: Option A 2015SPp1q1 Answer: Option C 2016PPp1q1 Answer: Option C 2015PPp1q1 Answer: Option C 2019PPp1q7 2023PPp1q3 Answer: Option D