MARKING MEMORANDUM. P a g e 1. WCED Metro Central Common Paper. Physical Sciences Paper 1. September 2016 QUESTION D 1.2 D 1.3 C 1.4 A 1.
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1 P a g e 1 WCED Metro Central Common Paper Physical Sciences Paper 1 September 2016 QUESTION 1 MARKING MEMANDUM 1.1 D 1.2 D 1.3 C 1.4 A 1.5 B 1.6 B 1.7 A 1.8 C 1.9 D 1.10 C [20]
2 P a g e 2 QUESTION mark per arrow and label subtract 1 mark for each of T y F N the following errors: no dot shown T x F fs T shown with its components (unless components in dashed lines) F g 2.2 When a resultant (net) force acts on an object, the object will accelerate in the direction of the force. This acceleration is directly proportional to the force and inversely proportional to the mass of the object. The resultant/net force acting on an object is equal to the rate of change of momentum of the object in the direction of the resultant/net force. (2 or 0) 2.3 ( ) Vertical forces; taking up as positive ( )( ) (A) (5) 2.4 Horizontal forces; taking left as positive (A) / (B): N.. (B) Sub into (B) Subst into (A) ( ) T sin(48,8 o ) = 137,06 T = 182,16 N DECREASES From:. The angle ( ) increases, so the vertical component of the tensional force ( ) will increase. From: F N + T y = F g increases/ T y increases The parcel will not push as hard into the table surface so the normal force will decrease in magnitude. [18]
3 Position (m) QUESTION ( )( ) P a g e 3 + ve 3.2 up ( )( ) + ve 5% energy loss so this represents 95% of the energy after the bounce. 3.3 (E P + E K ) TOP = (E P + E K ) BOTTOM [mgh + ½(0,05) 2 ] top = ( 0 + 0,91) (all subst) h = 0,685/ (0,05)(9,8) = 1,398 m = (0,4 m) Work Energy Theorem W nc = E p + E k 3.4 label of both axes time (s) [14]
4 QUESTION 4 P a g e The total linear momentum of an isolated (closed) system remains constant (is conserved). In an isolated system The total linear momentum before collision equals the total linear moment after collision. 4.2 Linear momentum conservation: Take towards Orion as the positive direction: ( )( ) ( ) ( ) ( ) 10 m A = 1,8 x ,2 x m A = 2,52 x kg Take towards Orion as the positive direction: ( )( ) ( ) ( ) Mass conservation: sub (A) into (B): sub into (B): (A) (B) Take towards Orion as the positive direction: ( )( ) ( ) ( ) m B = 4 m A - 9 x Mass conservation: (A) (B) sub (A) into (B): m A + 4 m A - 9 x = 3,6 x m A = 3,6 x x m A = 2,52 x kg 4.3 Take towards Orion as the positive direction: ( ) ( )( ) /kg m s -1 towards Orion (magnitude + direction) (5) 4.4 sub 3,6 x (2,52 x ) and ( )( )( ) ( ) sub converted [15]
5 P a g e 5 QUESTION The net (total) work done on an object is equal to the change in the object's kinetic energy. The work done on an object by a net (resultant) force is equal to the change in the object's kinetic energy. 5.2 ( )( )( ) work due to a conservative forces is equal to negative change in potential energy associated with that conservative force: 5.3 ( ) ( )( ) ( ) ( ) ( ) ( )( )(( )) ( )(( ) ) ( )( ) (6) REMAINS THE SAME The gravitational force is conservative (non-contact) force, so the work done by the gravitational force will not depend on the path taken. The starting and ending points are the same. Therefore the work done by the gravitational force will remain the same. [15]
6 P a g e 6 QUESTION The apparent change in frequency in sound heard due to the relative motion between listener and/or source ( ) ( ) (335 + v S) = 335 v S = 335 0,93 x 335 v S = = 25,22 m s Absorption (line spectrum) Red-shift Away from [9]
7 QUESTION 7 P a g e The force of attraction or repulsion between two charges is directly proportional to the product of their charges and inversely proportional to the square of the distance between them/ their centres. 7.2 ( ) + ve 7.3 L on K F net J on K 7.4 MAGNITUDE: ( ) ( ) ( ) DIRECTION tan = 2, = 63,43 Angle (show tan or other method) / BEARING 206,57 O 7.5 The electric field at a point is the electrostatic force experienced per unit positive charge placed at that point. + ve 7.6 [18]
8 QUESTION emf P a g e Load voltage external voltage terminal voltage Ω same V over each resistor and I is inversely proportional to R 8.5 V P = I P R P = (4,5)(1,2) = 5,4 V 18 (0,9 + 5,4) R = V/I = 11,7/ 4,5 = 2,6 (7) 8.6 Temperature 8.7 R P increases when S 2 is opened so R cir increases so I cir / current strength through ammeter decreases so V int (= Ir) decreases (r constant) so V ext increases (V ext = ε - V int ) [20]
9 P a g e 9 QUESTION ,10 s TOO DIM V rms for bulb = 100 V BUT V rms of generator 60 V. 9.4 I (A) 0,10 0,20 0,05 0,15 Time (s) [10]
10 P a g e 10 QUESTION Planck s constant 10.2 Threshold frequency ( ) is the minimum frequency of light needed to emit (eject) electrons from the surface of a certain metal / material ( )( ) The greater brightness would: - increase the number of photoelectrons but would have no effect on their kinetic energies / Remain the same ( ) E = W o + E k E k = E - W o ½ mv 2 = hf - W o ½ (9,11 x ) v 2 = (6,63 x )(5 x ) - (9,282 x ) v = 2,29 x 10 6 m s -1 Learners can calc the gradient of the graph which = 6,67 x and then use above method. [12]
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