ANSWERS AND MARK SCHEMES. (a) 750 MJ / 750,000,000 J 1 ½ 150, (a) 80 N in the direction of motion / 80 N forward. 1
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1 QUESTIONSHEET 1 (a) 750 MJ / 750,000,000 J 1 ½ 150, (b) engine thrust / jet thrust 1 weight of plane / downward force of plane due to gravity 1 (c) 500,000 d = d = 1500 m (units) QUESTIONSHEET 2 TOTAL / 7 (a) 80 N in the direction of motion / 80 N forward. 1 (b) work done = force distance J 1 (c) (i) 300 J 1 (ii) the sledge falls / slides down the hill 1 potential energy converted to kinetic energy. 1 TOTAL / 7
2 QUESTIONSHEET 3 (a) Terminal velocity 1 (b) Air resistance and gravity 1 (c) Air resistance reduces 1 Gravity remains constant 1 Resultant force/ unbalanced so acceleration. 1 (d) (i) Graph 2/3rds of paper used and correct ais 1 Majority of correct points plotted. 1 Anomalous result at 40secs not included in line. 1 Smoothed line/ curve of best fit used. 1 (ii) Gradient calculated using straight line values between secs 1 Accept answer m/s 1 TOTAL / 10
3 QUESTIONSHEET 4 (a) speed = distance/time 1 (b) 200 / = 10.35m/s 1 (c) ½ final speed time 1 ½ = 7.5 m 1 (d) speed / time / 2 1 = 3.75m/s 2 1 QUESTIONSHEET 5 TOTAL / 9 (a) 2000 m 1 (b) Alecia 1 (c) Alecia has stopped 1 (d) = 1.25 ms -1 1 (e) Dina overtakes Alecia 1 (f) Dina 1 (g) = 2.5 ms -1 1 TOTAL / 9
4 QUESTIONSHEET 6 (a) 1.2 s 1 (b) deceleration= change in velocity/time 1 = 27 / = 6.43 m/s 2 1 (c) distance in 1st 1.2s = velocity time 1 = = 32.4 m 1 distance until car stops = (27 4.2) / 2 1 = 56.7 m 1 total = = 89.1 m 1 TOTAL / 10
5 QUESTIONSHEET 7 (a) 3 Speed/ s Time/ s sensible scales 1 correct plotting 1 correct lines drawn 1 (b) (i) average acceleration = change in velocity / time 1 = 0.5 / 5 1 = 0.1 m/s 2 1 (ii) (3 2) / 5 1 = 0.2 m/s 2 1 (iii) As the man pulls the lorry, he is able to accelerate more once the lorry gets moving 1 TOTAL / 9
6 QUESTIONSHEET 8 (a) speed=distance/time 1 (b) (i) 100 / = m/s 1 (ii) 100 / 12 1 = 8.33 m/s 1 (iii) any viable reason: better diet/training technique improved in 100 years/ better footwear 1 (c) (i) 100 / = 2.49 m/s 1 (ii) resistance of water slows swimmer 1 QUESTIONSHEET 9 TOTAL / 9 (a) constant speed/constant velocity. 1 (b) 1 ms -2 : answer 1, units 1 2 (c) region c: deceleration from 20 to 10 ms -1 in 5 sec 1 region d: constant speed of 10 ms -1 for 20 sec 1 region e: deceleration from 10 to 0 ms -1 in 15 sec 1 (note: 1 mark for correct description for all 3 regions, but no quoted figures.) (d) Bus stop, traffic jam. 1 TOTAL / 7
7 QUESTIONSHEET 10 (a) (i) 0.9m 1 (ii) 0.3s 1 (iii) 1.6m 1 (b) conversion of 40kg to 400N J 1 QUESTIONSHEET 11 TOTAL / 5 (a) = potential energy gained potential energy 3seconds = power = 420 W 1 (b) Potential energy converted to kinetic energy. 1 (c) = 420 J working 2, correct answer with units 1 3 (d) = 420 time 1 t = = 4 seconds TOTAL / 7
8 QUESTIONSHEET 12 (a) (i) Speed (ms -1 ) Time (s) correctly plotted points 1 line joining points. 1 (ii) Rope fully stretched so speed changes from 60ms -1 to 0 / speed changes from 60ms -1 to 0. 1 (b) (i) formula: deceleration = change in speed 1 time correct answer with units: 60 ms -2 1 (ii) Upward force in the elastic 1 (c) (i) formula: acceleration = change in speed 1 time correct answer with units: 10 ms -2 1 (ii) force 1 of gravity 1 TOTAL / 10
9 QUESTIONSHEET 13 (a) 10 km 1 (b) formula: speed = distance 1 time correct answer: 1 km min -1 / 60 kmh -1 1 (c) (i) car is standing still / stationary 1 (ii) formula: speed = distance 1 time correct answer: 1.5 km min -1 / 90 km h -1 1 (d) use of re-arranged formula: time = distance 1 speed correct calculation of time for BC: 6 min 1 correct final answer: 12 min 1 TOTAL / 9
10 QUESTIONSHEET 14 (a) Speed m/s Time/ s sensible scales 1 correct plotting 1 correct lines drawn 1 (b) ½ final velocity time 1 ½ = 225 m 1 (c) moving at constant speed 1 (d) (i) line drawn from end of graph to ais at 75 s 1 (ii) change in velocity / time 1 = 20 / 15 1 = 1.33 m/s 2 1 TOTAL / 11
11 QUESTIONSHEET 15 (a) (i) Speed m/s Time/ s sensible scales 1 correct plotting 1 correct lines drawn 1 (Continued...)
12 QUESTIONSHEET 15 CONTINUED (ii) speed/time 1 = 15/5 1 = 3m/s 2 1 (iii) ½ final speed time 1 ½ = 37.5 m 1 (b) (i) line parallel to time ais 1 (ii) anywhere on last line sloping down 1 QUESTIONSHEET 16 TOTAL / 11 (a) speed=distance/time 1 =15 / =25m/s 1 (b) = 48m 1 (c) none 1 (d) Two from mass of car, friction surfaces e.g. brakes, road condition, tyres 2 TOTAL / 7
13 QUESTIONSHEET 17 (a) Distance (m) Time (s) Deduct one mark for each incorrectly plotted point 3 (b) (i) Kris: 4 ms -1 1 Joshua: 3 ms -1 1 average speed = distance 1 time (ii) Kris s car 1 (c) kinetic energy to heat and sound. 1 Kris Joshua TOTAL / 8
14 QUESTIONSHEET 18 (a) Speed (mph) X X X Time/(s) sensible scales 1 correct plotting 1 correct lines drawn 1 (b) 50 mph 1 X X (c) (i) distance travelled while reacting 1 (ii) distance travelled while braking 1 (d) Two from wet roads, driver may have drunk alcohol, driver tired, bald tyres 2 TOTAL / 8
15 QUESTIONSHEET 19 (a) Gravity/ weight 1 (b) stays the same. 1 (c) Write answers are:- (i) Unbalanced 1 (ii) Unbalanced 1 (iii) Balanced 1 (d) Constant/ steady/ same speed 1 (e) Stage 1: Acceleration 1 Resultant force is downward 1 Stage 2: Acceleration 1 Resultant force is upward. 1 QUESTIONSHEET 20 TOTAL / 10 (a) 40m/s 1 (b) (i) train travelling at 40m/s (constant speed) 1 (ii) train decelerates 1 (c) B 1 (d) distance = speed time 1 time = s 1 distance = = 600 m 1 TOTAL / 8
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