Free Body Diagram 2

Error

There was an error loading the page.

Contributors

William Haynes

Feedback

From users who are members of Engineering Statics :

William Haynes

said

Ready to use

5 years ago

History

○

William Haynes 3 years, 5 months ago

Saved a checkpoint:

Revised to fix errors in marking algorithm

Restore this checkpoint

○

William Haynes 3 years, 5 months ago

Saved a checkpoint:

Marking algorithm is not working. Any chosen answers get full credit

Restore this checkpoint

○

William Haynes 5 years ago

Created this as a copy of Free Body Diagram 1.

Name	Status	Author	Last Modified
Frame: Free Body Diagrams	Ready to use	William Haynes	06/10/2021 01:00
Ian's copy of Frame: Free Body Diagrams	draft	Ian Jeavons	03/06/2019 11:40
Katrin's copy of Frame: Free Body Diagrams	draft	Katrin Thomson	03/06/2019 11:53
Shivendra's copy of Frame: Free Body Diagrams	draft	Deactivated user	05/06/2019 18:48
Free Body Diagram 1	Ready to use	William Haynes	06/10/2021 00:47
Free Body Diagram 2	Ready to use	William Haynes	06/10/2021 00:42

There are 4 other versions that do you not have access to.

Question statement

Identify the errors (if any) in the student's free body diagram of post $CD$ . Contact at $C$ is frictionless. Both pieces have non-negligible weight.

{image('resources/question-resources/'+this['filename'])}

Give any introductory information the student needs.

			Name	Type	Generated Value

fbds	list	List of 5 items
this	dict	Dictionary with 2 entries
mistakes	list	List of 5 items
choices	list	List of 11 items
index	integer	3
matrix	list	List of 11 items

Automatically regenerate variables?

Name

Data type

Value

xxxxxxxxxx
 
[
    {
        "filename": "fbd-1_A1jE3RW.png",
        "errors": [
            "No errors"
        ]
    },
    {
        "filename": "fbd-2_AsVnLti.png",
        "errors": [
            "Incorrect reaction at D",
            "Missing weight"
        ]
    },
    {
        "filename": "fbd-3_R8yRyT1.png",
        "errors": [
            "Tension wrong direction",
            "Incorrect reaction at C",
            "Missing weight"
        ]
    },
    {
        "filename": "fbd-4_t09hKMf.png",
        "errors": [
            "Tension wrong direction",
            "Incorrect labeling",
            "Incorrect reaction at D",
            "Missing weight",
            "Force with known direction shown as components"
        ]
    },
    {
        "filename": "fbd-5_R9qCm5N.png",
        "errors": [
            "Missing labels",
            "Incorrect labeling",
            "Incorrect reaction at C",
            "Incorrect reaction at D",
            "Missing weight"
        ]
    }
]

Description

array containing problem image file name and cooresponding errors

Describe what this variable represents, and list any assumptions made about its value.

Can an exam override the value of this variable?

Generated value: `list`

[ [ "filename": safe("fbd-1_A1jE3RW.png"), "errors": [ safe("No errors") ] ], [ "filename": safe("fbd-2_AsVnLti.png"), "errors": [ safe("Incorrect reaction at D"), safe("Missing weight") ] ], [ "filename": safe("fbd-3_R8yRyT1.png"), "errors": [ safe("Tension wrong direction"), safe("Incorrect reaction at C"), safe("Missing weight") ] ], [ "filename": safe("fbd-4_t09hKMf.png"), "errors": [ safe("Tension wrong direction"), safe("Incorrect labeling"), safe("Incorrect reaction at D"), safe("Missing weight"), safe("Force with known direction shown as components") ] ], [ "filename": safe("fbd-5_R9qCm5N.png"), "errors": [ safe("Missing labels"), safe("Incorrect labeling"), safe("Incorrect reaction at C"), safe("Incorrect reaction at D"), safe("Missing weight") ] ] ]

This variable doesn't seem to be used anywhere.

Parts

Choose several from a list

Choose several from a list

Ask the student a question, and give any hints about how they should answer this part.

Check {length(mistakes)} {pluralise(length(mistakes),"box","boxes")}.

Minimum marks

Maximum marks

Show correct answer on reveal?

Show score feedback icon?

Advanced settings

Number of display columns

Minimum answers

Maximum answers

What to do if wrong number of answers selected:

Custom marking matrix?

Custom matrix expression

Show choice feedback state?

Marking method

For each choice, specify the number of marks to add or subtract when the student picks it.

Variable list of choices?

List of choices

Shuffle order of choices?

Advice

{mistakes}

Because the contact at $C$ is frictionless the force acts perpendicular to bar $ACB$ and should be drawn acting in that direction, although it is not strictly an error to dry components $C_x$ and $C_y$ this tends to lead to errors.
You can't push a rope, so the force of the cable on the post acts to the left.
There is a fixed connection at $D$ , so that should be represented by $D_x, D_y$ and a moment.
Since there is a non-negliable weight, don't forget the weight vector pointing down at the center of gravity.

Give a worked solution to the whole question.

URL

Text alternative
URL

Text alternative
URL

Text alternative
URL

Text alternative
URL

Text alternative
URL

Text alternative

Use this tab to check that this question works as expected.

There was an error which means the tests can't run:

Part	Test	Passed?
Choose several from a list
Choose several from a list		Hasn't run yet

This question is used in the following exams:

12. Free Body Diagrams by Michael Proudman in Engineering Statics.
test by Tim Harrell in TYK00 - Preparatory Quiz.
TYK0 - Preparatory Quiz by Tim Harrell in TYK00 - Preparatory Quiz.
12. Free Body Diagrams by William Haynes in Engineering Statics.

Loading...

Error

Metadata

Taxonomy: mathcentre

Taxonomy: Kind of activity

Taxonomy: Context

Contributors

Feedback

History

Comment

Checkpoint description

William Haynes 3 years, 5 months ago

William Haynes 3 years, 5 months ago

William Haynes 5 years ago

William Haynes 5 years ago

William Haynes 5 years ago

Error in variable testing condition

Error

Warning

Generated value: `list`

Parts

Choose several from a list

Advanced settings

Loading...

Error

Free Body Diagram 2

Metadata

Taxonomy: mathcentre

Taxonomy: Kind of activity

Taxonomy: Context

Contributors

Feedback

History

Comment

Checkpoint description

William Haynes 3 years, 5 months ago

William Haynes 3 years, 5 months ago

William Haynes 5 years ago

William Haynes 5 years ago

William Haynes 5 years ago

Error in variable testing condition

Error

Warning

Generated value: list

Parts

Choose several from a list

Advanced settings

Generated value: `list`