Chapter 1 (2)

MARKING SCHEMES –CHAPTER 1 ( Introduction To Science )

MARKS

QUES 1

CHARACTERISTICS a The longer the length of the pendulum the longer time is taken to complete one oscillation b i Manipulated V = Length of the pendulum ii Responding V = Time taken for one oscillation iii Controlled V = Mass/size of the pendulum c i. 20 cm ii. 100cm

TOTAL

1 3 2

d i

T 2.4 i m 1.8 e 1.2

x x x x

0.6 2 0

2

20 40 60 80 100 Length of pendulum(cm)

ii 1.5 s e P Q R P f The time of swing depends on the length of the pendulum Pendulum 20 cm ,period of swing = 20 seconds a Pendulum 30 cm, period of swing = 30 seconds Pendulum 40 cm , period of swing = 40 seconds Pendulum 50 cm , period of swing = 50 seconds b

Length of the pendulum (cm) 10 20 30 40 50

Period for 10 complete swing 10 20 30 40 50

Period for 1 complete swing 1.0 2.0 3.0 4.0 5.0

1 1 2

12

4

2

c

2

1

Time (s ) 5.0

x

4.0

x

3.0

x

2.0

x

1.0

x 0

d

e

f g

a 3 b c d

10

20

30

40

50

Length of the pendulum(cm ) The period of the pendulum swing is longer when the pendulum is longer // The longer the length of the pendulum, the longer the period of the pendulum to swing. Manipulated V = Length of the pendulum Responding V = Time taken for one oscillation // the period for one complete oscillation. Controlled V = Mass/size of the pendulum bob 2.5 s The period of the pendulum to make one complete swing increases with the length of the pendulum. // The period of the pendulum to make one complete oscillation increases when the length of the pendulum increases. // When the length of the pendulum increases , the period of pendulum to make one complete oscillation also increases. The child R with a shorter length will swing faster than the child P and Q. The child R has a shorter length of swing will swing fastest. The shorter the length of swing, the shorter the time taken to swing. i. A B C B A

1

3

1

1

14

1 1 1 1

2

e

Manipulated variable Responding variable

Length of swing/ pendulum

2

Time for one swing/ complete oscillation

f

2

g

2

1.2 second

1

3

The longer the length of string, the longer time taken to complete one oscillation.

1 12

4