Mechanics LAB REPORT.docx

MECHANICAL ENGINEERING DEPARTMENT

DJJ3053 ENGINEERING MECHANICS

LAB REPORT PRACTICAL 1 ( FUNDAMENTALS OF STATICS )

GROUP MEMBERS: NO

NAME

REGISTRATION NO

LECTURER’S NAME: PUAN YUNIZA BINTI AHMAD

Laboratory Report (100%) Evaluation Scale Criteria Excellent (4)

Introduction

Equipment & Safety Precaution

Procedures

Data Analysis

Discussions

Conclusion

References

Format

Detail information about the topics, objective/outcome stated, theory explained clearly Detail information about equipments used & safety precaution taken in laboratory. The procedure contains enough detail how the experiment was performed in excellent sentences. Data is recorded and analysis is well organized (tables/graph). Calculations are shown and units are present All important trends and data comparison have been discussed & interpreted correctly, good understanding leads to conclusions Summarizes the essential data used to draw conclusions, conclusions follow data (not wild guesses or leaps of logic), student shows good understanding Retrieve relevant information from various sources & formatted properly

Satisfactory Needs (3)

Improvement (2)

Deficient (1)

Information is nearly complete, objective /outcome stated but theory explained generally Briefly information about equipments used & safety precaution

Some introductory information and missing some major points

Little / incorrect information given

Little information given & irrelevant safety precaution

List the equipment used only

Detail procedure are covered with a few mistake in sentences

Aprocedure is missing some important Information and not written properly Data is recorded and been analyzed but no calculation to support

Missing several important experimental details

Data is recorded and been analyzed with few calculations and some of the units is missing

Data is poorly recorded and no analysis have been made Data is interpreted incorrectly & the argument is weak or nonexistent Conclusion missing / unable to draw the important points

Almost all of the results have been correctly interpreted and discussed, only minor improvements are needed Conclusion drawn successfully but could be better stated to show understanding.

Some of the results have been correctly interpreted but not been discussed, lack of understanding Conclusion have been drawn generally, many misstated, indicating a lack of understanding

Retrieve relevant information from one source (eg: internet only) & formatted properly

Some references are inappropriate & formatted incorrectly

References are inappropriate & formatted incorrectly

Neat, organized with headings, few spelling / grammar errors

Somewhat lacking in organization, multiple spelling / grammar errors, not neat

Note: This rubric is to be used with lab write-up handout. If any part of write-up is missing, a score of 0 will be given.

Score

1.0 Objective At the end of this experiment student should be able : To ilustrate the concapts of force and their components  Draw a Free-Body-Diagram(FBD)  Use data taken to prove an equilibrium of forrce

2.0 Theory A particle is said to be equilibrium if tge particle is at rest (if originally at rest) or has consistant velocity (if originally in motion). However , the term `equilibrium’ or more precisely `static equilibrium’ is normally used to describe an object at rest. In oder to maintain equilibrium, it is necessary to satisfy Newton ‘s First Law of Motion. Newton ‘s First Law of Motion requires that the resultant force acting on a particle to be equal to zero.This condition may be expressed as

∑𝐹 = 0 Where ∑𝐹 is the vector sum of all the forces acting on a particle And the supporting forces also can be determined via balances of moment.Balance of moment around support A and B: ∑𝑀𝐴 = 0

:RB(L)−FC X =0 RB = FC X/L L RC

RA

RB

3.0 Equipment & Safety Precaution The equipment that be use in the experiment is : Beam Apparatus  10 N Weight slot  Steel bar Safety precaution are maintain focus in the experiment. There for we had a rule when entering the labatory like so: Wearing a suitable clothing in the lab  Listening to the Lecturer oder  Caution when using the equipment

4.0 Procedure 1.0 Assemble all the equipment or apparatus that will be used. 2.0 A 10N weight slot is tie to distance X from point A. 3.0 The values of force is taken using a dynomometer.

5.0 Results

Length (X)

6.0

Load RA (N)

RB (N)

10cm

10

1

20cm

9.9

2

30cm

9.8

3.5

40cm

9.7

4.5

Discussion

Values of the bending stresses obtain from the experiment are presented in the table above and they are arranged in the respective cell according to the load that produce that bending moment. All the data is presented and according to that the theoretical bending moment is showing linear relation with the load means the value of the theoretical bending moment increase with the increase in the value of applied load and decrease with the decrease in the value of applied load. The ratio with which there is an increase and decrease in the value of theoretical bending moment is equal to the ratio with which there is an increase and decrease in the value of applied load.Other than that there is very little different between both value which show the correctness of apparatus and skills of the worker. Little different between the values is due to human error which cannot be minimize due to the human capabilities limitation.

7.0 Conclusion Aim of this task was to study the effect of different forces on the bending moment in the beam and the result show that there is a linear relationship between bending moment and applied load. Experimental and theoretical bending moment shows perfect linear relationship with applied load with very little difference in the values of bending moment.

8.0 References  Engineering Mechanical book  Wikipedia ( Equilibrium of Forces)