Free Body Diagram 1

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William Haynes

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William Haynes

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Ready to use

5 years ago

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William Haynes 3 years, 5 months ago

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William Haynes 5 years ago

Created this as a copy of Frame: Free Body Diagrams.

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

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Question statement

Identify the errors (if any) in the student's free body diagram of the smooth bar $ACB$ , pinned at $A$ .

{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 2 items
choices	list	List of 11 items
index	integer	0
matrix	list	List of 11 items

Automatically regenerate variables?

Name

Data type

Value

xxxxxxxxxx
 
[
    {
        "filename": "fbd-1_xI6ep5I.png",
        "errors": [
            "Body incorrectly isolated from supports",
            "Incorrect represention at C"
        ]
    },
    {
        "filename": "fbd-2_AdzNdwg.png",
        "errors": [
            "Body incorrectly isolated from supports"
        ]
    },
    {
        "filename": "fbd-3_frDmR9m.png",
        "errors": [
            "Body incorrectly isolated from supports",
            "Incorrect labeling",
            "Missing labels",
            "Missing arrowheads",
            "Incorrect represention at A",
            "Incorrect represention at C"
        ]
    },
    {
        "filename": "fbd-4_kKlRsW2.png",
        "errors": [
            "Incorrect represention at C"
        ]
    },
    {
        "filename": "fbd-5_zSYquRr.png",
        "errors": [
            "Incorrect represention at C",
            "Force with known direction shown as components"
        ]
    }
]

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_xI6ep5I.png"), "errors": [ safe("Body incorrectly isolated from supports"), safe("Incorrect represention at C") ] ], [ "filename": safe("fbd-2_AdzNdwg.png"), "errors": [ safe("Body incorrectly isolated from supports") ] ], [ "filename": safe("fbd-3_frDmR9m.png"), "errors": [ safe("Body incorrectly isolated from supports"), safe("Incorrect labeling"), safe("Missing labels"), safe("Missing arrowheads"), safe("Incorrect represention at A"), safe("Incorrect represention at C") ] ], [ "filename": safe("fbd-4_kKlRsW2.png"), "errors": [ safe("Incorrect represention at C") ] ], [ "filename": safe("fbd-5_zSYquRr.png"), "errors": [ safe("Incorrect represention at C"), safe("Force with known direction shown as components") ] ] ]

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")}.

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Marking method

For each choice, write 1 if the student should tick it, or 0 if they should leave it unticked.

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List of choices

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Advice

{mistakes}

When isolating the body, don't draw the pin at $C$ .
The pin connection at $A$ should be represented by $A_x$ and $A_y$ .
The force at $C$ has a known direction, perpendicular to bar $ACB$ . It is best to draw it at that angle rather than breaking it into components

Give a worked solution to the whole question.

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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.

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Taxonomy: mathcentre

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Taxonomy: Context

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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

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Generated value: `list`

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Free Body Diagram 1

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`