Form 2 Science Chapter 10 FORM 2 CHAPTER 10 SIMPLE MACHINE 1. Diagram 1.1 shows a wheelbarrow. (a) On Diagram 1.1, label the position of the fulcrum. [1 mark] (b)(i) Based on Diagram 1.1, state the class of lever of the wheelbarrow. …………………………………………………………………………………………………. [1 mark] (ii) Give one reason for your answer in (b)(i). …………………………………………………………………………………………………. [1 mark] (c) Based on Diagram 1.2, choose one tool with the same class of lever as the wheelbarrow in Diagram 1.1. Mark () in the box for the tool. JPN Pahang 2009 129 Diagram 1.1
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Form 2 ScienceChapter 10
FORM 2 CHAPTER 10 SIMPLE MACHINE
1. Diagram 1.1 shows a wheelbarrow.
(a) On Diagram 1.1, label the position of the fulcrum.[1 mark]
(b)(i) Based on Diagram 1.1, state the class of lever of the wheelbarrow.
………………………………………………………………………………………………….
[1 mark]
(ii) Give one reason for your answer in (b)(i).
………………………………………………………………………………………………….
[1 mark]
(c) Based on Diagram 1.2, choose one tool with the same class of lever as the wheelbarrow in Diagram 1.1.
Mark ( ) in the box for the tool.
[1 mark]
(d) Diagram 1.3 shows the situation when a force and a load are balanced.
JPN Pahang 2009 129
Diagram 1.1
Diagram1.2
Form 2 ScienceChapter 10
(i) Calculate force P needed to balance the metre rule.
Use the following fomula:
[3 marks]
(ii) What happens to the value of P if the load is moved nearer to the fulcrum?
………………………………………………………………………………………………….
[1 mark]
2. Diagram 2.1 shows a claw hammer.
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Diagram 1.3
Load x Distance of load form fulcrum = Force x Distance of force form the fulcrum
Form 2 ScienceChapter 10
(a) Label P, Q and R on Diagram 2.1 using the following words.
Fulcrum Load Effort
[3 marks]
(b) (i) What is the class of this lever system?
……………………………………………………………………………………………………
[1 mark]
(ii) State one reason for your answer in (b)(i).
……………………………………………………………………………………………………
[1 mark]
(c) Calculate the moment of force in Diagram 2.2 if a force of 50 N is exerted to pull the nail.
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Diagram 2.1
Q: ……………………….
R: ………………………
P: ………………………
Form 2 ScienceChapter 10
[2 marks]
3. Diagram 3 shows levers P, Q, R and S.
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Diagram 2.2
Moment of force (Nm) = Force (N) X Perpendicular distance (m)
Form 2 ScienceChapter 10
(a) Based on the observations in Diagram 3, state the class of lever P, Q, R and S.
P: ……………………………………………………………………………………………………
Q …………………………………………………………………………………………………….
R …………………………………………………………………………………………………….
S …………………………………………………………………………………………………….
[4 marks]
(b) Classify levers P, Q, R and S into two groups based on common properties.
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P Q
R S
Diagram 3
Form 2 ScienceChapter 10
Give examples of levers belonging to each group.
[4 marks]
4. Diagram 4 shows spanners P and Q which are used to tighten the nut at different time.
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P, Q, R and S
Common property
Alphabets representing the levers
Form 2 ScienceChapter 10
(a) (i) Which spanner will produce a greater turning effect?
…………………………………………………………………………………………………
[1 mark]
(ii) Explain your answer in (a)(i). ………………………………………………………………………………………………….
………………………………………………………………………………………………….
[1 mark]
(b) What are the factors that affect the moment of force?
(i) …………………………………………………………………………………………………
(ii) …………………………………………………………………………………………………
[2 marks]
(c) Calculate the moment of force on spanner P if a force of 20 N is used.
[2 marks]
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ForceForce
0.1 m 0.2 m
Spanner P Spanner Q
Diagram 4
Form 2 ScienceChapter 10
5. Diagram 5.1 shows Kok Meng and Ranjit on a see-saw. Kok Meng is 50 kg. He sits 120 cm from the fulcrum of the see-saw. The see-saw is in balanced when Ranjit who is 60 kg sits on the other end of the see-saw.
(a) (i) Name the class of lever shown in the Diagram 5.
……………………………………………………………………………………………………….
[1 mark]
(ii) Find the distance of Ranjit from the fulcrum.
[2 marks]
(iii) If Ranjit and another friend sit at the same end, what should Kok Meng do to balance the see-saw?
……………………………………………………………………………………………………
[1 mark]
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Diagram 5.2
Form 2 ScienceChapter 10
(b) Diagram 5.2 shows a pair of ice tongs.
(i) What class of lever is the ice tong?
…………………………………………………………………………………………………..
[1 mark]
(ii) At which point, A, B, C or D is the biggest effort needed to hold the ice cube? Why?
…………………………………………………………………………………………………..
…………………………………………………………………………………………………...
[2 marks]
(iii) What is the relationship between the effort and the effort arm?