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Chapter 4 – Machines and Mechanical Systems

Chapter 4 – Machines and Mechanical Systems. Review. The engineering cycle describes how an invention gets from concept to reality. Which of the following best describes the order of steps in the engineering cycle?

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Chapter 4 – Machines and Mechanical Systems

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  1. Chapter 4 – Machines and Mechanical Systems Review

  2. The engineering cycle describes how an invention gets from concept to reality. Which of the following best describes the order of steps in the engineering cycle? • A. Evaluate, design, build a prototype, test B. Design, build a prototype, test, evaluate C. Design, mass produce, test, and evaluate D. Design, mass produce, apply for a patent, sell stocks • B

  3. A simple machine often multiplies your: • force

  4. Mechanical advantage can be defined as the ratio of: • Output force to Input Force

  5. Which of the following block and tackle systems has the largest MA? • C

  6. A simple machine has an input force of 10 N and an output force of 100 N. What is the MA of the simple machine? • MA = Fo/Fi • 100N/10N = 10

  7. NOT ON PAPER • A lever rotates around a fixed point called a: • fulcrum

  8. The human arm is an example of which class of lever? • 3rd Class

  9. The lever in the picture will: A. stay balanced. B. rotate clockwise. C. rotate counter-clockwise. D. do none of the above. • B

  10. A slanted surface used to raise an object is a(n) . • Inclined Plane

  11. A bar that is free to pivot about a fixed point is a . • Lever

  12. The amount by which a machine multiplies an effort force is called the . • MA

  13. A winding ramp used to build the pyramids is an example of a(n) __ __. • Inclined Plane

  14. A device that does work with only one movement and changes the size or direction of a force is a(n) __ __. • Simple Machine

  15. See-saw is an example of which class of levers? • 1st class

  16. **** • A testable model of a conceptual design • Prototype

  17. NOT ON PAPER • Application of science to solve problems • Engineering

  18. Human legs are examples of this class of lever • 3rd Class

  19. An inclined plane wrapped around a cylindrical post is a ____. • Screw

  20. Wheelbarrow is an example of which class of lever? • 2nd Class

  21. An object with interrelated parts that work together to accomplish a task • Mechanical system

  22. Fishing Pole is an example of this class of lever. • 3rd Class

  23. When wrapping the ropes around the pulley more times, what happens to the force required to lift an object? • It Decreases

  24. A block and tackle is designed with 5 supporting ropes. If a 250N object is to be lifted with this machine, what is the minimum input force that can be applied? • Force required=weight of the object/number of support ropes • 250N/5=50N

  25. A 1st class lever is used to lift a 500N load. If the input arm is 6 ft long, what is the minimum length of the output arm that would allow the load to be lifted using only 125N of input force? • Input arm length X input force = output arm length X output force • 6ft(125N)=output arm(500N) • Output arm=(6ft x 125N)/(500N) • 1.5ft

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