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Essential Question: How can I change gears to work less when going up a hill?
Mastery Objectives:
SWBAT make decisions on whether to select a large gear or a small gear depending on road conditions.
SWBAT calculate torque multiplier.
SWBAT calculate speed multiplier.
Essential Vocabulary:
Driven Teeth Gear Driver Diameter
Drive Mechanical Advantage Clockwise Moment Circumference
Torque Speed Counter Clockwise Radius
Resources:
https://www.youtube.com/watch?v=nWx5zCJSOU8 - Video explaining gears and levers
https://www.youtube.com/watch?v=uz436Ixbl-I - Video explaining how to calculate torque multiplier and speed multiplier.
https://www.teachengineering.org/content/umo_/lessons/umo_challenges/umo_challenges_lesson02_presentation_v6_dwc_EV3.pdf - Slideshow describing how gears work.
Do Now: Answer the following questions:
What is a gear?
List many examples of gears or objects that use gears.
Gear Generator:
Directions: Play with the gears to see if you can make the gears run faster or if you can make the gears run with less effort.
Problems:
1. Imagine two 40-tooth gears contacting each other. When one 40-tooth gear turns once, how many times will the other 40-tooth gear turn? 2. Now, imagine replacing one of the 40-tooth gears with an 8-tooth gear, with the 40-tooth gear turning the 8-tooth gear. When the 40-tooth gear turns once, how many times will the 8-tooth gear turn?
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