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Simple Machines Continued: Gears and Friction

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Gears Explain what gears are. (p. 20) What materials are gears typically made of? (p. 20) What are gears typically used for? (p. 20) List at least four example of real-life machines that use gears. Explain what a gear train is. Quickly sketch a simple two-gear train. (p.20/figure 5) Explain what a gear ratio is. (p. 20) A bicycle is an example of a two-gear train connected by a chain. If your front (driver) gear has 10 teeth, and the follower (back) gear has 50 teeth, how many times must your pedal the front gear around to have the back gear rotate once? Explain how you know. (figure 5) If your front (driver) gear has 60 teeth, and the follower (back) gear has 15 teeth, how many times will the rear gear rotate when the front gear turns once? Explain how you know. (figure 6) Fill in the blanks. With a __________ gear ratio, the gear can be turned with less ________ but must go a longer __________. (figure 6a) Fill in the blanks. With a __________
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Simple Machines Continued: Wheel and Axles & Pulleys Questions

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Wheel and Axles 1.      List three types of simple machines that are used for transmitting rotational motion. (p. 18) 2.      What is the MA for all these groups of machines? 3.      In these groups of machines the __________________ must move over a greater _______________ than the _________________. (p. 18) 4.      Briefly explain what the two main parts of a wheel and axle system are. Include a quick sketch. (p. 18 / figure 1) 5.      Answer the question below figure 2. (p. 18) 6.      List four or more examples of common wheel-and-axle systems. (p. 18) 7.      Explain how one of the three systems from the previous question work. (p. 18) 8.      Wheel and axle system can change: rotary movement into ___________ movement OR rotary movement into _____________________ OR linear motion into _______________ (p. 18) 9.      Solve for the velocity ratio in figure 3. (p. 18 / p. 12 – formula) Pulley Systems 1.      Give two examples of where pu
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Levers & Mechanical Advantage Test Hints

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  Know the formula for mechanical advantage (MA) Know how to solve MA problems Know the units for MA Understand and explain the difference between the size of the load force and effort force when the MA is greater than 1, exactly 1 and less than 1 Identify and understand the difference between class 1, class 2 and class 3 levers Know two examples of class 1, class 2 and class 3 levers Explain the purpose of using levers Label the fulcrum, effort force, load force, effort arm and load arm on a lever diagram Helpful videos: https://www.youtube.com/watch?v=YlYEi0PgG1g https://www.youtube.com/watch?v=J2Nt_rRa3JY
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Hydraulic Machines - Build Report

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Hydraulic Machine Build Report Name and Class: 1.    1. What did you make? 2.    2.   Function (what does it do)? 3.     3. Explain what makes your project a hydraulic machine. 4.    4. Explain what role hydraulics play in your machine. 6.    5.   Expand on the one aspect of your project you found most challenging and briefly explain why. 6. Explain how you overcame the challenge in question #6. 7.     7. If you were to rebuild your structure, describe two things you would do differently to end up with a better final product. 8.    8.   Briefly describe any new hands-on skills you learned or improved upon through this project (i.e. –measuring, sawing, drilling, glue gun, using a mitre box, scroll saw, band saw, drill press, etc.).
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Introduction to Mechanical Advantage and Efficiency

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Introduction to Mechanical Advantage and Levers List five things machines do. (p 8) A machine is a _______________ made of one or more _______________ that work together to accomplish a task. (p. 8) Describe the subsystems a can opener is made of and what the role of each subsystem is. (p. 8/figure 2) Explain what a mechanism is. (p. 8) In your own words, explain what a self-correcting control is. (p. 9) Explain what a lever is. (p. 10) Give four or five real-world examples of levers. (p. 10) Explain why are levers useful. (p. 10) Levers are broken down into three types. List them. (p. 10) Give one or two real-world examples for each type of lever. (p. 10/11/figure 1/2/3) All levers require a fulcrum, load force and effort force. Explain what each of these are. (p. 10) Make a quick sketch of a Class I, Class II and Class III level. Neatly label the fulcrum, effort force and load force on each diagram you made. Also label the load arm and
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Fluids Unit Test - Study Hints

*The unit test is on  Thursday, April 12 *If you are absent due to illness or athletics it is your responsibility to arrange a make-up date with Mr. Mak as soon as possible *Extra help is ALWAYS available - speak to Mr. Mak -What are fluids? Which two states of matter? -Aerodynamics and real-world uses/examples -Hydrodynamics and real-world uses/examples -Laminar vs. turbulent flow of fluids -Viscosity - thick vs. thin, high vs. low, how cohesion impacts viscosity, flow rate -Explain the difference between mass and weight -Know common units for mass, weight and volume -Archimedes' Principle - How to find the volume of irregular objects using displacement -What is density? -Solve questions using the density formula (with proper units!) -Describe the impact of temperature on density and viscosity using particle  theory -Buoyancy - positive, neutral and negative - describe the forces  involved (gravity vs. buoyant force) -What is ballast? Give real-world examples (i.e.
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