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February 23, 2025

February 23, 2025. Do Now: Read through the Lever Lab directions and answer the first three questions Find the weight in Newtons of the gravel container by using the spring scale (that is your resistance ) Homework: Study for test and finish contract project. First Class. Second Class.

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February 23, 2025

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  1. February 23, 2025 • Do Now: Read through the Lever Lab directions and answer the first three questions • Find the weight in Newtons of the gravel container by using the spring scale (that is your resistance) • Homework: Study for test and finish contract project

  2. First Class Second Class Third Class

  3. Today • Lever Lab • Review last test • Review Incline Plane results • Kahoot

  4. Six Simple Machines • Inclined Plane • Wedge • Screw • Lever • Pulley • Wheel & Axle

  5. Mechanical Advantage

  6. Terminology Where your hands are Where the load is Load Output Resistance Input DISTANCE • Effort • Input • Output DISTANCE

  7. Mechanical Advantage • Resistance Force = Input Distance = Effort Distance = Output Force Effort Force = Output Distance = Resistance Distance = Input Force

  8. Other forms of the MA formula:

  9. Mechanical Efficiency Mechanical Efficiency = Work Output X 100 Work Input

  10. Inclined Plane • Reduces force, but increases distance • The mechanical advantage of an inclined plane is length divided by height. • Wedges and screws are types of inclined planes.

  11. MA = L/H

  12. Wedge • A wedge generates outward forces • A wedge is a type of inclined plane. Its mechanical advantage is its length divided by its greatest thickness.

  13. Screw • A screw is an inclined plane wrapped around a cylinder • Uses a small force over a longer distance • The closer the threads, the lower the force required

  14. Levers – Three Classes • Can change direction & size of force • In a first-class lever, the fulcrum is between the force and the load. • In a second-class lever, the load is between the force and the fulcrum. • In a third-class lever, the force is between the fulcrum and the load.

  15. First Class LeverChange direction & maybe force

  16. Second Class LeverChange force, but not direction

  17. Third Class LeverDon’t change direction, output < input

  18. Pulleys • Change direction and may change input force • Types of pulleys include fixed pulleys, movable pulleys, and block and tackles.

  19. Wheel and Axle • The mechanical advantage of a wheel and axle is the radius of the wheel divided by the radius of the axle.

  20. Compound Machines • Compound machines consist of two or more simple machines. • Compound machines have low mechanical efficiencies because they have more moving parts and therefore more friction to overcome.

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