A complete BIOLOGY SPM exam focus ,marking scheme included. Made BIOLOGY learning easier!
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Sains Form 2
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Sheet Music FORM TWO CHAPTER 9 STABILITY
1
Diagram 1.1 shows three wooden blocks labelled as A, B and C which are placed on a smooth board. One side of the block is lifted slowly to find out which block falls easily.
A
B
C
Diagram 1.1
(a) Which Which object object is the most most stable? stable?
………………………………………………………………………………………………… [1 (b) Which object is the most unstable?
…………………………………………………………………………………………………
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(i) Draw a diagram to show how you would place the wooden block to make it more stable.
[1 mark (ii) What are the factors that influence the stability of the wooden block?
(a) ………………………………………………………………………………………
(b) ……………………………………………………………………………………… [2
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2.
Model A, B and C in Diagram 2.1 have the same height.
A
B
C
Diagram 2.1
(a) (i) Which model is the most stable?
………………………………………………………………………………………………… (ii) Give a reason for the answer in (a)(i).
.……………………………………………………………………………………………… [2 (b) (i) Which object is the least stable?
……………………………………………………………………………………………… (ii) Give a reason for the answer in (b)(i).
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3.
(a) Diagram 3.1 shows two vases of flowers, P and Q.
P
Q Diagram 3.1
(i)
Based on your observation in Diagram 3.1, state the difference in the stability vase P and vase Q.
………………………………………………………………………………………………… [1
(ii)
What inference can be made based on Diagram 3.1?
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(iii)
State
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hypothesis based on your observation in Figure 8.1.
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(b) A student carries out an experiment to investigate the situation in Diagram 3.1. Diagr 3.2 shows the apparatus set-up for the experiment.
Pulley Plasticine
Weights
Stick
Diagram 3.2 The student takes the following steps:
Step 1: A lump of plasticine is made into a shape of a cylinder to form a model. Step 2: Four sticks of equal size are fitted into the four corners of the model to form t legs so that it can stand on the table. Step 3: A string is hooked to the model. The string then passes over a pulley fixed at edge of the table. A dish is tied to the end of the string. Step 4: Weights are added to the dish until the model topples. Step 5: The weight needed to topple the model is then recorded. Step 6: Steps 2 to 6 are repeated using sticks of different lengths.
(i)
Record the weight needed to topple models P, Q and R in Table 3.3.
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Pulley Plasticine 10
Stick
20
12 cm
Model Q
Pulley Plasticine
5 10
Stick
16 cm
Model R
Model
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(ii)
Using Table 3.3, draw a bar chart to show the weight needed to topple the differ models. ) N ( l e d o m e l p p o t o t d e d e e n t h 70 g i e W
60 50
40 30 20
[2
(c) State the relationship between the length of the sticks and the weight needed to topp 10 the model.
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…………………………………………………………………………………………………… Model
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[2
(e) Based on the graph, predict the weight needed to topple the model if the length of the stick is longer than 16 cm.
………………………………………………………………………………………………… [1 (f) Based on the experiment, experiment, state state the relationship between the position position of the centre o gravity and the stability of an object.
…………………………………………………………………………………………………
………………………………………………………………………………………………… [1
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4.
Diagram 4.1 shows four tables, P, Q, R and S. Q
P
S
R
Diagram 4.1 (a)(i) Which table is the most stable?
………………………………………………………………………………………………… [1 (ii) Explain your answer in (a)(i).
…………………………………………………………………………………………………
………………………………………………………………………………………………… [1 (b)(i) Which table is the least stable?
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(ii) Explain your answer in ( b)(i).
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[2 (d) Diagram 4.2 shows shows a racing car.
Diagram 4.2 How is a racing car designed so that it will not fall over easily in a race?
……………………………………………………………………………………………………
…………………………………………………………………………………………………… [2
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