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MALAYSIAN POLYTECHNICS

MINISTRY OF EDUCATION

MODULE JJ33001100MMEECHCHAANINICCSS OOFF MMAACHCHIINNEESS 11

Zainol Hashim (POLIMAS)Harisa Mohamad Saad (POLIMAS)

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BIODATA OF MODULE WRITERSJ3010 Mechanics Machines

Name : Zainol Bin HashimAddress : Mechanical Engineering Department

Politeknik Sultan Abdul Halim Mua’dzam Shah, Bandar Darulaman06000 JitraKedah Darulaman

Telephone No. : 04-9174701 ext.407Qualifications : B Sc Mech. Eng.(UTM)

Diploma Mech. Eng (UTM) Cert.Education

Position : Polytechnic Lecturer

Name : Harisa Bt Mohamad SaadAddress : Mechanical Engineering Department

Politeknik Sultan Abdul Halim Muadzam Shah, Bandar Darulaman06000 JitraKedah Darulaman

Telephone No. : 04-9174701 ext.822Qualifications : B Eng. Agricultural (Food and Process)

(UPM)Masters in Education (ITTHO)

Position : Polytechnic Lecturer

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What Do You Think Of This Module?

Title of Module: Module Code :

Student’s Name: Registration No. :

Course:

Module Writers:

Please use the following scale for your evaluation:

4 Strongly Agree3 Agree2 Disagree1 Strongly Disagree

Instruction : Please I on the space provided.

No. How much do you agree with the following statements? SCALE

A. FORMAT 1 2 3 4

1 The pages are organized in an interesting manner.2 The font size makes it easy for me to read the module.

3The size and types of pictures and charts used are suitable for the input.

4 The pictures and charts are easy to read and understand.5 The tables used are well-organised and easy to understand.6 The arrangement of the Input makes it easy for me to follow.7 All the instructions are displayed clearly.

B. CONTENTS 1 2 3 4

8 I understand all the objectives clearly.9 I understand the ideas conveyed.

10 The ideas are presented in an interesting manner.11 All the instructions are easy to understand.12 I can carry out the instructions in this module.13 I can answer the questions in the activities easily.14 I can answer the questions in the self-assessment.15 The feedback section can help me identify my mistakes.16 The language used is easy to understand.17 The way the module is written makes it interesting to read.18 I can follow this module easily.19 Each unit helps me understand the topic better.

20I have become more interested in the subject after using this module.

CURRICULUM GRID

The curriculum grid of this module is based on the curriculum used by Malaysian polytechnics.

No. TOPIC UNIT TotalHours

1 GeneralDynamics

1( 9 H)

9 Hours

2 MomentInertia

2( 6 H)

6 Hours

3 Hoisting system

3( 6 H )

6 Hours

4 Friction 4( 6 H )

6 Hours

5 Screw 5(6 H )

6 Hours

6 Belting 6( 9 H )

9 Hours

UNIT 1 GENERAL DYNAMICS

1.1 Velocity and Acceleration1.2 Equation for linear, uniformly accelerated motion1.3 Relationship between linear speed and angular speed1.4 Relationship between linear acceleration and

angular acceleration

1.5 Work done by a constant force1.6 Power1.7 Energy and conservation of energy1.8 Momentum and conservation of momentum

UNIT 2 MOMENT OF INERTIA

2.1 Moment of Inertia2.2 Theorem of Parallel axes2.3 Theorem of Perpendicular axes2.4 Moment of Inertia in a few simple cases2.5 Torque and Angular Acceleration2.6 Angular Momentum2.7 Angular impulse2.8 Work done by a torque2.9 Angular kinetic energy2.10 Kinetic energy of a torque

UNIT 3 HOISTING SYSTEM

3.1 Inertia Couple3.2 Accelerated Shaft3.3 Shaft being brought to rest3.4 Load raised and with accelerating upward3.5 Load falling and accelerating downwards (No driving torque

acting)3.6 Load falling and being brought to rest3.7 Load rising: Coming to rest under friction only3.8 Load balancing system

UNIT 4 FRICTION4.1 Motion up the plane: pull P parallel to plane4.2 Motion down the plane: Pull P parallel to plane4.3 The angle of friction and total reaction4.4 Application of angle of friction to motion on the inclined

plane

UNIT 5 SCREW

5.1 The square thread screw5.2 The V- thread screw5.3 Raising Load5.4 Load being lowered5.2 Overhauling of a screw

UNIT 6 BELTING

6.1 Length of an open belt drive6.2 Length of cross belt drive6.3 Power transmitted by a belt6.4 Ratio of tensions6.5 Centrifugal tension

MODULE GUIDELINES

To achieve maximum benefits in using this module, students must follow the instructions carefully and complete all the activities.

1. This module is divided into 6 units.2. Each page is numbered according to the subject code, unit and page number.

J3010 / UNIT 1 / 5

Subject Unit 1 Page Number 5

3. The general and specific objectives are given at the beginning of each unit.4. The activities in each unit are arranged in a sequential order and the

following symbols are given:

OBJECTIVESThe general and specific objectives for each learning topic are stated in this section.

INPUTThis section introduces the subject matter that you are going to learn.

ACTIVITIESThe activities in this section test your understanding of the subject matter. You have to complete this section by following the instructions carefully.

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FEEDBACKAnswers to the questions in the activity section are given here

SELF-ASSESSMENTSelf-assessment evaluates your understanding of each unit.

FEEDBACK ON SELF-ASSESSMENTThis section contains answers to the activities in the self-assessment.

5. You have to follow the units in sequence.6. You may proceed to the next unit after successfully completing the unit and

you are confident of your achievement.

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GENERAL AIMS

This module is prepared for students in the third or fourth semester who are undergoing the Certificate/Diploma programmes in Malaysian Polytechnics. It aims to expose students to the mechanics of machines concept in each unit and to lead them towards self-directed learning or with guidance from their lecturers.

PRE REQUISITE SKILLS AND KNOWLEDGE

The pre-requisite for this module is at least a pass in Mathematic at the SPM level and the successful completion of the Engineering Science module in the first semester.

GENERAL OBJECTIVES

At the end of this module, students should be able to:

1. know principles and fundamental concept of general dynamics.2. know method and procedures to solve problem of mechanics machines.3. understand facts and principles all of these topics.4. solve problem in relation to hoisting and friction.5. solve problem of raising and lowering load for square and Vee threaded screw.6. find the values of Belting by using a calculator.

TEACHING AIDS AND RESOURCES NEEDED

1. Calculator

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REFERENCES

1. John Hannah and M.J. Hillier (1971). Applied Mechanics; New ZealandPitman: Publishing Limited.

2. W. Madill (1984). Applied Mechanics Level 3; Longman Inc., NewYork: Longman Group Limited.

3. D Humphrey and J Topping (1971). A Shorter Intermediate Mechanics; London: Longman Group Ltd.

4. George E. Drabble (1971). Applied Mechanics; London: W.H. Allen & Co.Ltd.

5. R.S. Khurmi (1988). A Text Book Of Applied Mechanics;New Delhi: S. Chand & Company (Pvt) Ltd.

6. R.K. Mullis (1983). Engineering Mechanics; Longman Cheshire Pty.

7. S.B.Mathur (1979). Applied mechanics; Delhi: Khanna Publishers.

8. L.Bostock and S.Chandler (1979). Applied Mathematics; Scotland: ThomsonLitho Ltd.