SASS 2025 sec 4E prelim paper 2

3 Prelim Examination 2025/4Exp/Physics paper 2 [Turn over Section A Answer all questions. 1 A ball is released from rest at point A and moves along a smooth track ABCDE as shown in Fig. 1.1. The ball is shown at point A and as it passes point B. The ball is always in contact with the track and air resistance is negligible. Fig. 1.2 shows the distance−time graph for the ball as it moves from A to E.

4 Prelim Examination 2025/4Exp/Physics paper 2 [Turn over (a) (i) On Fig. 1.2, mark: • with the letter P one point where the ball accelerates • with the letter Q one point where the ball has constant speed. [2] (ii) Determine the speed of the ball at point X on Fig. 1.2. Show your working. speed = ....................................[2] (b) The speeds of the ball at A, B, C and D are vA, vB, vC and vD respectively. Arrange these four speeds from slowest to fastest. slowest fastest [1]

5 Prelim Examination 2025/4Exp/Physics paper 2 [Turn over 2 Fig. 2.1 shows a uniform plank AB of length 2.0 m suspended from two ropes X and Y. The weight W of the plank is 210 N. The force in rope X is P. The force in rope Y is Q. (a) State, in terms of P, the moment of force P about B. ........................................................................................................................[1] (b) Calculate: (i) the moment of W about B moment = ...........................................................[1] (ii) the force P force P = ...........................................................[2] (iii) the force Q. force Q = ...........................................................[2]

6 Prelim Examination 2025/4Exp/Physics paper 2 [Turn over 3 (a) State what is meant by the principle of conservation of energy. ............................................................................................................................ ........................................................................................................................[1] (b) Fig. 3.1 shows a girl throwing a