Page 32 - Spotlight A+ Physics Form 4.5

Physics SPM Model Paper

Paper 2

Section A
[60 marks]
Instructions: Answer all questions in this section.
kQq
1. Coulomb’s law can be expressed in the form of the equation F = ——— where F is the force, Q and q are
r 2
the charges and r is the distance between the two charges.
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(a) Based on the equation, state one example of
(i) base quantity,
(ii) vector quantity. [2 marks]
(b) Derive the unit of k in terms of the base S.I unit. [2 marks]

2. Figure 2 shows the velocity against time graph of the motion of an MRT along a straight line track.
–1
Velocity / m s

20
15

SPM MODEL PAPER ©PAN ASIA PUBLICATIONS
10
5

Time / s
0
40
30
50
60
20
90
10
70
80
Figure 1
(a) What is the average speed travelled by the MRT in the first 70 s?
(b) What is the physical quantity represented by the gradient of the graph from 0 s to 10 s? [2 marks]
[1 mark]
(c) Describe the movement of the MRT,
(i) from 10 s to 70 s
(ii) from 70 s to 90 s. [2 marks]
3. Figure 3 shows a cargo ship being towed by two tug boats using the same force of 1 200 N. The resultant force
from the two tug boats causes the cargo ship to move forward.
P

Tug boats

20°
20°
Cargo ship
Q

Tug boats
Figure 2

510