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Force, Work, Power

Force, Work, Power. Mrs. Eaton. Today you will learn about Engineering Fields and will learn how to calculate Force, Work, and Power. SSR Share Engineering Job Research Notes on Force, Work, and Power. Homework due: A5 Engineering Careers. Share out: You will be assigned partners

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Force, Work, Power

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  1. Force, Work, Power Mrs. Eaton

  2. Today you will learn about Engineering Fields and will learn how to calculate Force, Work, and Power • SSR • Share Engineering Job Research • Notes on Force, Work, and Power

  3. Homework due: A5 Engineering Careers • Share out: You will be assigned partners • Person A is the one whose birthday is coming up soonest, Person B is the other person. • Person A tell Person B about the engineering field you chose • Person B, in your engineering notebook, write down your partner’s name and the engineering field they studied. Write down one question you have about that field. What more do you want to know about that type of engineer? • Switch roles. Person B tell Person A, Person A writes a question. • Then, you will get new partners

  4. Chapter 3 – The Mechanical Advantage • Force, Work, and Power • Six Simple Machines • Inclined plane • Wedge • Lever • Pulley • Wheel and axle • Screw

  5. *FORCE: A push or pull that acts on an object to initiate or change its motion or to cause deformation

  6. We are going to talk about 2 main types of forces • Effort force – The input • The energy to move the object • Could be generated by a person, motor, engine, magnetic field, spring, moving water, wind or any other phenomena that creates • Load force – The output • The weight of the object or • The resistance needed to overcome to move object

  7. Force: Friction is a type of Force

  8. There are many different types of forces

  9. There are many different types of forces

  10. Force is measured in • Newtons(N) in the metric system • Pound (lb) in the US customary system of units • 1 pound of force is approximately 4.4 newtons

  11. *WORK is a measure of the amount of energy transferred when a force acts on an object • Measured in: • foot-pounds (ft-lb) • inch-ounces (in-oz) • newton-meters (N-m) • Joules (J): 1J = 1 N-m Work = Force * Displacement • Displacement is like distance, except it includes a direction… • Displacement would be: I hit the ball 200 meters NORTHEAST • Distance would be: I hit the ball 200 meters

  12. How much work have I performed if I push on a wall?

  13. Which is more efficient? • Moving a desk – push side • Moving a desk – push top

  14. If the force is NOT being applied parallel to desired direction, then you use the following formula: Work = Force * Displacement * cosine of angle of the applied force

  15. Example: See book page 65 • Draw a sketch of the problem, Label the information that you know • Write the formula • Write the variables that you know (with units) • Plug in the numbers (and units) • Using a calculator, compute the answer • ALWAYS list UNITS!!!

  16. Which is more powerful?

  17. Power is the amount of work accomplished in a certain amount of time “Power equals Work divided by time” • Measured in: • foot-pound per second (ft-lb/sec) • Watt: 1 watt = 0.739 ft-lb/sec

  18. Example from page 65 • If the woman moving the box took 20 seconds to move the box, how much Power did she exert • in ft-lb/sec? • in watts? • If the woman moving the box took 20 hours to accomplish the task, how much Power did she exert • in ft-lb/sec? • in watts?

  19. Homework due Tues • WORKBOOK: Read page 32 and do problem on page 33 – Exercise 3.1 on a SEPARATE PIECE OF PAPER. (SPOP) • TEXTBOOK: Read “The Six Simple Machines” on Pages 69-71; skim the pictures on pages 71-96 to get an idea of the types of machines, then • WORKBOOK: do Simple Machines on the bottom of page 32. DO THIS IN YOUR ENGINEERING NOTEBOOK

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