ACJC 2023 J2 H2 Physics Prelim P2_MS

Anglo-Chinese Junior College 2023 J2 Preliminary Exam Paper 2 MS H2 (9749) Physics JC2 2023 Page 1 of 10 Qn Suggested MS 1(a) 21 2s ut gt=+ Since u = 0, 2 2 2 1 2 2 2(5.88) (1.1) s gt sg t g = = = -19.72 m sg= (b) t should be recorded for every 100cm of h e.g. 100cm, 200cm till 600cm. Plot the graph for h against t2 and get a best fit line. Obtain g = 2 × gradient. The best fit line reduces/removes the systematic error that might be present if the vertical intercept is non-zero. This results in a more accurate value of g. (c) Loss in GPE (0.010)(9.72)(5.88) 0.571 J mgh= = = (d) 2 2 2 2() 2 hU m h t mhU t = = Hence 22U m h t U m h t    = + + 1 1 0.12( ) 2( )0.571 10 588 1.1 U = + + 0.163J=U (0.6 0.2)JUU = 

Anglo-Chinese Junior College 2023 J2 Preliminary Exam Paper 2 MS H2 (9749) Physics JC2 2023 Page 2 of 10 2)(a) (i) 22 2 1 1 0 5 2 52 2585 2 68 =− = + = = = = () . ( . )( ) .. ( ) ( ) . A B AB s vt s ut at t ss tt ts 20 5 2 5 6 8 57 8== . ( . )( . ) .Bsm (ii) (b) (i) Vertical component 22 1 2 2 2 9 81 6 5 11 3 − =+ = = =( . )( . ) . y y y yy v u gs v gs ms 11 3 11 5 44 5   = = .tan . . (ii) Final horizontal velocity is the smaller The other component of the velocity is correct  will therefore be larger

Anglo-Chinese Junior College 2023 J2 Preliminary Exam Paper 2 MS H2 (9749) Physics JC2 2023 Page 3 of 10 3(a)(i) It is the resultant vertical upward force exerted by the fluid on an object as the pressure at the bottom surface is greater than that at the top. Upthrust is equal in magnitude and opposite in direction to the weight of the fluid displaced by a submerged or floating object. 3(b)(i) B1 – correct direction with labeling B1 – correct length of U, W and T and point of action (ii) 34 1 51 3 9 81 22 5432   = == .( . )( ( ) )( . ) . U Vg N 22 54 0 3 9 81 19 6 =+ =− = − =. ( . )( . ) . U T mg T U mg N (b)(ii) Net force upwards as upthrust is more than weight As altitude increases, air pressure/density decreases, causing upthrust to decrease Upthrust will decrease till its magnitude is equal to weight.

Anglo-Chinese Junior College 2023 J2 Preliminary Exam Paper 2 MS H2 (9749) Physics JC2 2