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DAILY LESSON PLAN FORM 1 (KEMAHIRAN ASAS SAINS-KAS)

MODULE 18

TITLE Laboratory Scientific Investigation (Steps in scientific

investigation)

LEARNING

OUTCOMES

1. Able to state the steps in scientific investigation,

2. Able to carry out a pendulum experiment and record data.

3. Able to write lab report in a proper format.

4. Able to work collaboratively with partner or group.

APPARATUS Retort stand and clamp, stop watch, meter rules, pendulum bob.

MATERIALS Cork (cut into halve), thread

ACTIVITIES Engagement1. Teacher shows a video clip of a woman frying an egg.

Based on the video clip, students are asked to explainabout the activity briefly.[Explanation should include;The materials needed e.g egg. Oil, panthe procedure to fry the eggResult: fried egg]

2. Teacher gives comments and relate the answers given withsteps in scientific investigation

Exploration

Part A [2 periods]

1. Students are divided into groups of 4.2. Teacher distributes Appendix 18 to the students.3. Teacher asks students to take all apparatus and materials

needed for this activity.4. They are asked to do Activity 1 by using all skills in KAS

that they have learned before.5. During the activity, teacher asks them to:

i. determine what I want to find out

ii. make a smart guess

iii. change the conditions for the experiment

iv. write down what has been observed (data)v. decide whether the hypothesis is true

Class 1 1

Date

Time

Venue Chemistry Lab Chemistry Lab

Attendance /25 /25 /25

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Part B [ 2 periods ]

1. Teacher proceeds with Activity 2 and 3.

2. Teacher explains about the correct steps of scientificinvestigation.

3. Then, teacher asks the students to write a lab report whichincludes the following information;

a) Aim

b) Problem statement

c) Hypothesis

d) List of variables

e) List of Materials and Apparatus

f) Procedures

g) Diagram of apparatus set up

h) Tabulation of data

i) Graph

j) Discussion

k) Conclusion

4. Teacher discusses the report and answers with students

EnrichmentTeacher asks the students to submit the report as a PEKA reportand teacher should explain briefly about PEKA to students

CONCLUSION Correct steps in scientific investigation is important to get good

result

Notes: teacher needs to conduct a session to explain

the implementation of PEKA (PENATARAN PEKA)Reflection:

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SUGGESTED ANSWER

Topic : The steps in scientific investigation.

Aim : To investigate the relationship between the length of a pendulum and thetime taken

for the pendulum to make ten complete swings.

Problem Statement: How does the length of a pendulum affect the time taken for ten

complete swings?

Hypothesis: The shorter the length of the pendulum, the lesser the time taken for ten

complete swings.

Manipulated variable: Length of the pendulum

Fixed variable: mass of the pendulum bob / 10 complete swings / position of the

pendulum bob when released

Responding variable: Time taken for 10 complete swings.

Material and apparatus :

Retort stand and clamp, thread, cork (cut into halve), stop watch, meter rules.

Procedure :

1. A simple pendulum of 100 cm is set up by using a meter ruler as in Figure 1.

2. The pendulum is pulled to one side and released to let it swing freely.

3. The time taken for the pendulum to make 10 complete swings is recorded by usingstopwatch.

4. Step 2 - 3 are repeated to obtain two more readings. The average time taken iscalculated.

5. Step 2 - 4 are repeated using different lengths of pendulum (80cm, 60cm, 40cm and20cm).

6. The results are recorded in Table 1.

7. A graph of the time taken to complete ten swings against the length of the pendulum isplotted.

Attachment

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Observation :

Length of

pendulum

(cm)

Time taken to complete 10 swings (s)

1st reading 2nd reading 3rd reading Average

20 8.0 8.0 9.0 8.3

40 13.0 14.0 13.0 13.3

60 16.0 17.0 16.0 16.3

80 18.0 19.0 18.0 18.3

100 20.0 20.0 21.0 20.3

Table 1

Graph of time taken to complete ten swings against the length of the pendulum.

Interpreting data

From the graph, we can deduce that the pendulum with shorter length takes shorter time to

make ten complete swings.

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Discussion

1. When the pendulum thread is shortened, the time taken for ten complete swings is lesser.

2. The time taken for ten complete swings is 1.7 s

3. The length of string increases, the time taken for ten complete swings increases.

4. Child P takes 20 seconds to complete 5 swings in diagram (a)?

i. The time taken for the child P to make one complete swing in diagram (a) is 20/5 = 4 s

ii. The time taken by child P using swing in diagram (b) to make 5 complete swings ismore than 20 s.

5. Because the length of pendulum for the first reading is shorter than the final reading.

Conclusion

The hypothesis is accepted.

The time taken for ten complete swings will be lesser when the length of the pendulum

decreases.