Sunday, 13 November 2011

Strength and Stability

Subject             : Science
Date                 : 01.11.2011 (Tuesday)
Time                : 10 : 00 – 10 : 30 (30 min)
Standard           : 5S
Enrolment        : 41 pupils
Topic                : Strength and Stability
Sub-topic          : 1.2.2 Identify the factors that affect stability of objects
Learning Outcomes : By the end of the lesson, pupils will be able to
a)      Explain how base area affect stability.
b)      Explain how height affect stability.
Previous knowledge : Pupils are familiar with,
a)      Stable and unstable objects such as standing on high and low chair.
b)      Factor makes structures strong.
Thinking skills : Making hypothesis, generating ideas, making conclusions
Moral values : Being cooperate, being respect
Teaching and learning resources : Plastic bottles, bigger cylinder, thinner cylinder, high stool, low stool, 
                                                       5 cent and 50 cent coins, hemisphere and sphere blocks, worksheet


(5 min)

To predict the stability of upright position and upside down

1  Teacher asks pupil to come in   front to set up the bottle.
2  Teacher asks pupils to predict the stability of upright position and upside down will topple easily.
Predict :
A bottle in an upright position has a bigger base area. It is therefore more stable than a bottle in an upside down position.

Plastic bottles

Thinking Skill : predict

Step 1
(10 min)

Step 2
(5 min)

To observe the relationship between the base area/ height and the stability of objects.

Group discussion to make :
a   Hypothesis
b   Conclusion

1  Teacher asks pupil conduct an experiment in groups to observe the relating to effects of base area on the stability of objects.
2  Teacher provides each group :
Group A  5 bigger cylinder and 5 thinner cylinder.
Group B high stool and low stool.
Group C 5 cent and 50 cent coins.
Group D hemisphere and sphere blocks.
3  Teacher asks pupils to observe which objects will topple easily when the objects set up in straight.
4  Pupils work in groups and record their finding on the stability of objects.

1   Teacher asks pupil to discuss in group to make hypothesis and conclusion.

2   Teacher goes around to observe pupils.

Bigger and thinner cylinder
High and low stool
5cent and 50cent coins
Hemisphere and sphere blocks

Thinking Skill: to observe

Moral Value : Being cooperate

Thinking Skill : make hypothesis and conclusion

Moral Value  : Being cooperate
Step 3
1  Teacher asks each group make presentation for group discussion.
2   Pupils respond :
Hypothesis / conclusion :
2.1  The bigger the base area of the objects, the more the stable of the objects.
2.2  The smaller the base area of the objects, the less the stable of the objects.
2.3  The higher the height of the  structure, the less stable the objects is.
2.4  The lower the height of the  structure, the more stable the objects is.
3  Teacher discuss the answer with pupils.
Moral Value : Being respect

(3 min)

1   Teacher give worksheet to each pupil.
2   Teacher goes around to observe pupils.

AVA : worksheet

Name :
 Class :

Topic : Strength and Stability

The diagram below shows an investigation.
Amin placed the cylinder A, B and C which have the same size of base area but different height on a plank. He shaked the plank. He observed which of the cylinder will fall down the last.


(a)    Which of the cylinder falls down the last?
(b)   Explain your answer mentioned in (a).
(c)    What is the aim of this investigation?
(d) What is measured in this investigation?
(e)    What is measured in this investigation?
(f)    What conclusion can be made based on the observations?
(g)   State another thing that affects the stability of a structure.


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