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Foundations of Physical Science

Foundations of Physical Science. Workshop: The Lever. The Lever. CPO Science. How does a lever work? What is the relationship between force and distance in a simple machine? What factors balance a lever?. Key Questions. Describe how a lever works

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Foundations of Physical Science

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  1. Foundations of Physical Science Workshop: The Lever

  2. The Lever CPO Science

  3. How does a lever work? What is the relationship between force and distance in a simple machine? What factors balance a lever? Key Questions

  4. Describe how a lever works Identify the relationship between force & distance on a lever Apply the concept of mechanical advantage to levers Overview

  5. Introducing… The Lever • Anatomy of the lever • Fulcrum – point around which the lever rotates • Input Force – Force exerted ON the lever • Output Force – Force exerted BY the lever

  6. Three Classes of Levers • First Class - fulcrum between Input and output • Second Class – output between fulcrum and input • Third Class – input between fulcrum and output

  7. CPO Lever – First Class All The Way • Here we have a first class lever • The fulcrum is between the input and output • Can you get two weights to balance?

  8. A Lever in Equilibrium • Hang your weights like shown here • Does the lever balance? • What variables can be changed to balance a lever

  9. Amount of Input Force Amount of Output Force Length of Input Arm Length of Output Arm Variables Involved in Levers

  10. Hang weights from the lever and get it to balance Try 4 trials and record how many weights to hang and where you hang them Levers Investigation

  11. What mathematical relationship can you find that will balance the lever every time? Put your rule in terms of Input and Output and forces and distances What if there is more than one location on either side of the Lever? Mathematical Rule for Balancing the Lever

  12. Input Force x Length of Input Arm= Output Force x Length of Output arm Force x Distance = Force x Distance # of Weights x Distance = # of Weights x Distance What is the Relationship?

  13. Sum of Input = Sum of Output (Force a x Distance a) + (Force b x Distance b) = (Force c x Distance c) + (Force d x Distance d) What if there are several groups of weights?

  14. We use the same kind of relationship for all simple machines to calculate Mechanical Advantage Output Force/Input Force Length Input Arm/Length Output Arm Mechanical Advantage

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