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  SMK (L) METHODIST KUALA LUMPUR FORM 4 MID YEAR EXAMINATION 2014 MARKING SCHEME PHYSICS PAPER 2 SECTION A NO ANSWER MARK 1 a) Stem 1 1 b) To measure the depths 1 1 c) (i)  Negative zero error 1 1 c) (ii) -0.7 mm or -0.07 cm 1 Total   4 2 a) Velocity is a vector quantity (has magnitude and direction) while speed is a scalar quantity (has magnitude only). Velocity is ratio of displacement to time while speed is the ratio of distance to time. Any other relevant answer. 1 2 b) 1- ms75.1 18)10)()(2( 21 takentime traveleddistancespeedAverage      1 1 2 c) 1- ms11.1 1820 takentimentdisplacemetotalVelocity   1 1 Total 5 3a) Momentum is the product of mass and velocity . 1 3 b) Since the bullet and the pistol should have opposite and equal momentum , the velocity of the bullet is much greater since the mass is much smaller . 1 1 3 c) (i) 10 kg ms -1  1 3 c) (ii) 1-111-2211 2211 sm20010)05.0( smkg10is pistolfor themomentumrecoiltheGiven that 0  vvvmvm vmvm  1 1 Total 6 4 a) Work is defined as the product of an applied force and displacement of an object in the direction of the applied force. 1 4 b) (i) Work done = 220 × 0.5  = 110 J  1,1 4 b) (ii) Work done = mgh  = 20 × 9.8 ×0.5 or 20 × 10 × 0.5 = 98 J or 100 J  1,1 4 c) (i) The work done by the worker is more than the work done on the load. 1 4 c) (ii) Some work is wasted to overcome friction / energy lost. 1 Total 7 5 a)  N255305)10(3   g   F W  F   1  NO ANSWER MARK 5b) 2- sm3.133525  m F ama F   2 5c) 3 5d)  N63.20 5)13.3(5   g  g   F maT  F T  F   2 Total 8 6 a) 500 N 1 6 b) (i) 1. At rest 2. Moving with constant velocity 1 1 6 c)  R = mg + F or  R = mg - F 1 6 d) The normal reaction, R, is the summation of the weight,  W, and the resultant force acting upwards on the students.  1,1 6 e)(i) The reading of the weighing scale decreases 1 6 e)(ii)  Normal reaction = Weight  –   Resultant force 1 Total 8 7 a) PQ 1 7 b) QR 1 7 c)(i) 2- sm67.2 1.54car toy theof on accelerati    1,1 7 c)(ii) m5)5.14(4 21ntdisplaceme    1,1 7 d) (i) Any suitable suggestion with explanation 1,1 7 d) (ii) Any suitable suggestion with explanation 1,1 Total 10 8 a) Equilibrium state is the state of an object in which the resultant force acting on the object is zero. 1 8 b) W = mg   = 2.0 (10) = 20 N 1 8 c) 1,1  NO ANSWER MARK 8 d)(i) T 1  = 5.8 cm = 11.6 N T 2  = 7.0 cm = 14.0 N 1 1 1,1 8 d)(ii) The most suitable method of hanging the mirror is as shown in Diagram 8.1 . The tension of the string  T 1  as shown in Diagram 8.1 is less than  the tension  T 2  as shown in Diagram 8.2a 1,1 8 e) v = u + gt   = 0+ 10 (0.6) = 6 m s -  1,1 12 SECTION B NO ANSWER MARK 9 a)(i) Elasticity is a property of matter that enables an object to return to its srcinal shape and size when the forces that are acting on it are removed. 1 9 a)(ii) -   Thickness of M < Thickness of N -   Maximum height in Diagram 9.2 (b) > Maximum height in Diagram 9.2 (a). -   The maximum height of the ball increases as the thickness of the spring increases. -   Thickness of the spring is proportional to the spring constant, k -   The elastic potential energy of the spring increases as the thickness of spring increases. 1 1 1 1 1 9 b)(i) -   F 2  is bigger than F 1  -   The spring shown in Diagram 9.1 (b) is made of thicker wire than the spring as shown in Diagram 9.1 (a) 1 1 9 b)(ii) Elastic potential energy   kinetic energy   Gravitational potential energy 2 9 c) i,ii,iii,iv Suggestion Reason i. Tight and light attire / spiked shoes Less air friction / increases the speed ii. Sprints / increases speed To increase kinetic energy / momentum iii. More elastic and light Easily bent / increases the elastic potential energy and easy to carry iv. Strong pole / use a thicker mattress Not easily broken / increases the collision time / reduce the impulsive force iv. Bending of the athlete’s body during the fall Increases the collision time / reduces the impulsive force 10 Total 20 10 a) Acceleration is the rate of change of velocity. 1 10 b) (i) Mass of lorry P < Mass of lorry Q Distance travelled by lorry P >Distance travelled by lorry P Velocity of lorry P > Velocity oflorry P 1 1 1 10 b) (ii) a) the mass is inversely proportional to the distance travelled by the lorries.  b) the mass is inversely proportional to the acceleration of the lorries. 1 1  NO ANSWER MARK 10 c) (i) 1  –   free  body diagram 1  –   correct direction of the forces 1  –   correct label 10 c) (ii) This is because the magnitude of the applied force is equal to the magnitude of the frictional force that acted on the car. 1 10 d)    The position of the seat and the handle -   The handle must slightly below the seat’s level    The attire of the cyclist -   Tight and light attire to reduce the air resistance    The material used for the bicycle -   Use light material to reduce the weight of the bicycle    The size of the tyre -   Use thin tyre to reduce the friction between the tyre and the road    Other components for its motion -   The pressure of the tyre, must be suitable, not too low or not too high 2 2 2 2 2 Section C NO ANSWER MARK 11 a) The principle of the conservation of momentum. 1 11 b) -   When the ball on one end is pulled up and let to fall, it strikes the second ball which is at rest and comes to a dead stop. -   The principle of conservation of momentum states that in a collision between two objects, the total momentum of the objects in the system remains unchanged. -   The energy and momentum from the first ball is transferred to the second ball and then transmitted to the second ball and then transmitted through the balls at rest to the ball on the other end. -   The momentum of the ball becomes zero as its velocity is zero. -   Because the momentum and energy is maintained in this system, the ball on the opposite side will move at the same velocity as the ball that were in initial motion. 1 1 1 1 1 11 c)    The balls touch each other -   This will reduce losses of energy which will reduce the speed of the balls.    The type of material used to make the balls is steel. -   Steel balls are hard and produce highly elastic collision. Energy can be easily  propagates through the intermediate balls.    Two strings used to hang each ball -   This string arrangement restricts the ball’s movements to the same place.      The position of the ball to start the oscillation -   High position of the ball, high potential energy and will change to high kinetic energy. The last end ball will swing at higher speed. The most suitable design is Q because the balls touch each other, made from steel, use two strings attached to each ball and the initial position of the ball is high. 2 2 2 2 2
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