TABLE OF CONTENTS - Lindbergh School District

Concept F: Simple machines (levers, inclined planes,
wheel and axle, pulleys) affect the forces applied to an
object and/or direction of movement as work is done
2.2.F.a Describe the relationships between work,
applied net force, and the distance an object
moves
STRAND 7C, 8.1B
Concept F: Simple machines (levers, inclined planes,
wheel and axle, pulleys) affect the forces applied to an
object and/or direction of movement as work is done
2.2.F.b Explain how the efficiency of machines
can be expressed as a ratio of work output to
work input
STRAND 7C
Concept F: Simple machines (levers, inclined planes,
wheel and axle, pulleys) affect the forces applied to an
object and/or direction of movement as work is done
2.2.F.c Describe power in terms of work and time
STRAND 7E, 8.1B
Concept F: Simple machines (levers, inclined planes,
wheel and axle, pulleys) affect the forces applied to an
object and/or direction of movement as work is done
2.2.F.d Analyze and describe the relationship
among work, power, and efficiency
STRAND 7C, 7E, 8.1B
C1
C8
D
T
W
C1
C8
D
T
W
C3
C8
T
C1
C2
C10
T
Put weights (ex. Books) on a platform. Have a
student try to lift the weights with no help.
Discuss the need for ramps, including handicap..
(1.10, 3.1, 3.2, 3.5)
Continuing from 2.2.F.a., now use a machine, like
a car jack to lift the books. If no car jack, set up a
pulley system Identify the input and output force.
(1.10, 3.1, 3.2, 3.5)
Explain the formula, P = work x time. Encourage
students to be patient with themselves in doing the
math.
(1.10)
Find the amount of work you do going up the
stairs. Have students relate to how many light
bulbs they can power by going up the stairs once,
or more often.
(3.2)
Students will think of other situations
where a lot of force is needed to do a job,
like digging a hole, etc. How would you
make the job easier
Students will work through the following
situation: You can't move the refrigerator
from the kitchen to the moving truck.
How would you do it.
Students will do power problems.
Students will use lab scenario and give
students different sets of data and have
them calculate the power.
Strand 1: Properties and Principles of Matter and Energy
2. Energy has a source, can be transferred, and can be transformed into various forms but is conserved
between and within systems
Major Objectives IS Suggested Activities Suggested Assessments
Concept F: Energy can change from one form to
another within and between systems, but the total
amount remains the same
1.2.F.b Compare the efficiency of simple
machines (recognizing that, as work is done, the
amount of usable energy decreases with each
transformation as it is transferred as heat due to
friction)
STRAND 7A, 7B, 7D
C3
C11
W
Have students design a block and tackle system to
lift a weight. Using a spring scale determine the
input force. Calculate the output force. Students
will find that the output force is less than the input
force.
Students will explain why the output is
less than the input.
(1.2, 1.3 1.10, 3.5, 3.7)
Concept F: Energy can change from one form to C2 Give the students a paper clip. Straighten it. Touch Students will determine how far someone
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