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Physics Form 4 Chapter 2 Force and Motion I
24. A student has a mass of 45 kg. What is the weight of the student if
C v
the gravitational field strength is 9.81 N kg ?
–1
A 54.8 N
B 220.7 N
C 441.5 N
D 450 N
t
D v

t Chapter

2

Subjective Questions
Section A

1. Diagram 1(a) shows the motion of a black ball towards a white ball. Diagram 1(b) shows the motion of both
SPM balls after collision.
2012
Stationary
A B A B

Before collision After collision

(a) (b)
Figure 1
Table 1 shows the momentum of the balls before and after the collision.
Table 1
–1
Momentum before collision (kg m s ) Momentum after collision (kg m s )
–1
A B A B
2.0 0.0 0.5 1.5

(a) What is the meaning of momentum? [1 mark]
(b) Based on the table, determine the total momentum of the balls
(i) before the collision, [1 mark]
(ii) after the collision. [1 mark]
(c) Compare the answers in b(i) and b(ii). [1 mark]
(d) (i) Based on the answers in b(i) and b(ii), state a conclusion about the total momentum. [1 mark]
(ii) Name the physics principle involved in d(i). [1 mark]
(e) State one condition needed in order to apply the physics principle stated in 1d(ii). [1 mark]
(f) The total kinetic energy of the balls decreases after the collision. What type of collision is this? [1 mark]

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