3) You stand at the end of a uniform diving board a distance d from support 2 (as shown in the picture below. Your mass is m and the distance between the supports is a. Draw an extended-body force diagram and use it to find the forces (magnitude and direction) that supports 1 and 2 exert on the board (you can neglect the force Earth exerts on the board itself).

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Chapter9: Statics And Torque
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3) You stand at the end of a uniform diving board a distance d from support 2 (as shown
in the picture below.
Your mass is m and the distance between the supports is a. Draw an extended-body
force diagram and use it to find the forces (magnitude and direction) that supports 1
and 2 exert on the board (you can neglect the force Earth exerts on the board itself).
Ability A1: Can extract the information from representation correctly
Needs Work
Some of the information is
extracted correctly, but not
all of the information. For
example, physical
quantities are represented
with numbers there are no
units. Or directions are
missing. Subscripts for
physical quantities are
either missing or
inconsistent.
Adequate
All necessary information has
been extracted correctly and
written in a comprehensible
way. Objects, systems,
physical quantities, initial
and final states, etc. are
identified correctly and units
are correct. Physical
quantities have consistent
subscripts.
Adequate
The diagram contains no
errors and each force is
labeled so that it is clearly
understood what each force
represents.
1 2
Adequate
Mathematical procedure is
fully consistent with the
design. All quantities are
calculated correctly with
proper units. Final answer is
meaningful.
Inadequate
Information that is extracted
contains errors such as
labeling quantities
incorrectly, mixing up initial
and final states, choosing a
wrong system, etc. Physical
quantities have no
subscripts (when those are
needed).
Ability A5: Is able to construct a force diagram
Needs Work
Inadequate
Missing
No visible attempt is made
to extract information from
the problem text.
FD contains no errors in
vectors but lacks a key
feature such as labels of
forces with two subscripts
or vectors are not drawn
from single point, or
components are drawn
instead of forces.
FD is constructed but
contains major errors such
as incorrect mislabeled or
not labeled force vectors,
length of vectors, wrong
direction, extra incorrect
vectors are added, or
vectors are missing.
Ability D7: Is able to choose a productive mathematical procedure for solving the problem
Inadequate
Needs Work
Correct and complete
mathematical procedure is
described but an error is
made in the calculations. All
units are consistent.
A mathematical procedure is
described, but is incorrect
or incomplete, due to which
the final answer cannot be
calculated. Or units are
inconsistent.
Missing
No representation is
constructed.
Missing
Mathematical procedure is
either missing, or the
equations written down are
irrelevant to the design.
Transcribed Image Text:3) You stand at the end of a uniform diving board a distance d from support 2 (as shown in the picture below. Your mass is m and the distance between the supports is a. Draw an extended-body force diagram and use it to find the forces (magnitude and direction) that supports 1 and 2 exert on the board (you can neglect the force Earth exerts on the board itself). Ability A1: Can extract the information from representation correctly Needs Work Some of the information is extracted correctly, but not all of the information. For example, physical quantities are represented with numbers there are no units. Or directions are missing. Subscripts for physical quantities are either missing or inconsistent. Adequate All necessary information has been extracted correctly and written in a comprehensible way. Objects, systems, physical quantities, initial and final states, etc. are identified correctly and units are correct. Physical quantities have consistent subscripts. Adequate The diagram contains no errors and each force is labeled so that it is clearly understood what each force represents. 1 2 Adequate Mathematical procedure is fully consistent with the design. All quantities are calculated correctly with proper units. Final answer is meaningful. Inadequate Information that is extracted contains errors such as labeling quantities incorrectly, mixing up initial and final states, choosing a wrong system, etc. Physical quantities have no subscripts (when those are needed). Ability A5: Is able to construct a force diagram Needs Work Inadequate Missing No visible attempt is made to extract information from the problem text. FD contains no errors in vectors but lacks a key feature such as labels of forces with two subscripts or vectors are not drawn from single point, or components are drawn instead of forces. FD is constructed but contains major errors such as incorrect mislabeled or not labeled force vectors, length of vectors, wrong direction, extra incorrect vectors are added, or vectors are missing. Ability D7: Is able to choose a productive mathematical procedure for solving the problem Inadequate Needs Work Correct and complete mathematical procedure is described but an error is made in the calculations. All units are consistent. A mathematical procedure is described, but is incorrect or incomplete, due to which the final answer cannot be calculated. Or units are inconsistent. Missing No representation is constructed. Missing Mathematical procedure is either missing, or the equations written down are irrelevant to the design.
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