Transcript Welcome to Algebra 2 w/Trigonometry!

POE Agenda 09/10/2012
 Put page numbers on the LOWER outside corner of the
next several pages of your notebook; always save the last 2
lines for signatures and the date. Look at your notebook
rubric (page 2) to see what you can improve on this week.
 COMPLETE Activity 1.1.1b-d
 LABEL the sections of your notebook
 Finish pulley set-up & data (annotated sketch);
 Then do calculations & questions
 Last one is the inclined plane set-up
 You don’t really need all those gadgets, just a base plate & weight
 Annotated sketch, data, calculations & questions
 Put all pieces away
Activity: Wheel & Axle:
1)
Measure the diameter of the axle, and the diameter of the wheel, and calculate the IMA.
2)
Measure the fishing weight (FR). Attach it to the string attached to the axle. Pull on the other
string (attached to the wheel, FE) with the spring scale. Calculate the AMA & Efficiency.
3)
Attach the fishing weight (FR) to the string attached to the wheel. Pull on the other string
(attached to the axle, FE) with the spring scale. Calculate the AMA & Efficiency.
4)
Come up with a real-world example of wheel driving axle, and axle driving wheel.
5)
Answer:
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Was it more difficult to apply effort to the wheel or to the axle?
Based on the experiment above, why do you think the steering wheel on a school bus is so large by comparison
to a regular car?
Activity: Fixed Pulley (1.1.1.c):
1)
2)
3)
4)
Create a fixed pulley system. Create a scaled annotated drawing of the fixed pulley system.
What is the IMA of the fixed pulley system?
Use a spring scale on the string opposite the fishing weight to determine the force needed to
obtain static equilibrium. Calculate the AMA & Efficiency of the pulley system.
Answer:
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In the block and tackle system, explain how mechanical advantage relates to the number of strands.
In a block and tackle system with a mechanical advantage of 3, the effort is measured at 15 lbf. The
resistance, when balanced, is measured at 42 lbf. What factors might account for the loss in energy?
Activity: Inclined Plane (1.1.1d):
1)
2)
3)
4)
5)
Create an inclined plane utilizing various fischertechnik® building components. Attach one end
of the string to the fishing weight (resistance force) and the other end to a force measuring
device. Place the weight on the inclined plane and string over the pulley. Create a scaled
annotated drawing of your inclined plane system. Be sure to identify all variables and give
answers in proper units.
Calculate the IMA of the inclined plane system.
Calculate the ideal effort force needed to overcome the known resistance force.
Using a spring scale, pull the string and determine the force needed to obtain static equilibrium.
Calculate the AMA & Efficiency of the inclined plane system.
Answer:
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Describe one real-world example of an inclined plane.
What are some benefits of using an inclined plane?
What other mechanisms could replace an inclined plane?