You are the manager of Denton Sand and Gravel. Friday is here and it is time to pay your employees.
The pay rate is $2.00 per every Joule of work done. Your employees have brought you a detailed work
log and you need to determine how much they get paid.
Tommy’s Work Log Amount of
work (j)
Pay for work in
dollars
Activity
Lifted a 23 kg bag of sand a distance of
1 1.5 meters on to a truck.
Carry 23 kg bag of sand 6 meters
2
Shovel 60 kg of gravel into a
3 wheelbarrow 0.5 meters off the ground
4
5
Push the wheelbarrow 8.5 meters
Total
7th grade performance task, Unit 2.1
Congratulations…. based on the scientific definition of work you paid Tommy correctly!
Unfortunately Tommy is upset that he did not get paid for carrying the bag of sand. Briefly explain to
Tommy why he did not get paid to carry the bag of sand. Advise Tommy how he can change the
situation to accomplish work in the future.
Oops…. you paid Tommy incorrectly!
He should have been paid $1149.00. To save your job, look back at Tommy’s work log to see where you
made the mistake. Remember the formula for work (W = Fd) and the movement must be in the
direction of the force. Resubmit the work log once you have made the correction(s).
7th grade performance task, Unit 2.1
Unit 2.1 Performance Task Rubric
Category
Solution & Strategy
Scientific Ideas &
Concepts
Data Manipulation
1
There is no answer,
or the solution fails
to consider a
significant part of the
problem.
2
The answer is
presented without
any support.
An attempt to
describe a strategy is
Little or no strategy is made, or a wrong
given to show
answer is given with
thinking skills or
an inappropriate
prove the line of
strategy or line of
reasoning.
reasoning and
thought.
The student does
The student recalls
NOT recall scientific
some scientific ideas
ideas and concepts.
and concepts.
The student fails to
manipulate or
transform data when
appropriate.
The student
incorrectly
manipulates data or
fails to show all
information
Including
calculations.
3
The answer is
essentially correct
with most of it
being supported.
A strategy is
essentially correct
with most of it
being supported.
The student
explains some
scientific ideas and
concepts.
The student
properly
manipulates data
into forms
sometimes
inapplicable to
investigation.
4
The answer is correct,
and the solution is
supported in detail.
A perfect and clearly
delineated strategy
shows a high level of
thinking skills and
defined reasoning.
The student explains all
scientific ideas and
concepts thoroughly.
The student correctly
manipulates data into
appropriate forms
applicable to the
investigation.
7th grade performance task, Unit 2.1