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Simple Machines

Investigation 2 – PostLab

 

 

 

 

 

 

 

ANALYZE IT

Complete the Analysis Questions in your SDR then discuss them as a class.

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Note: The following Analysis Questions are for Trials 1-3. Table A is located below for reference.

  • Calculate: Determine the mechanical advantage due to force for each position of the fulcrum on the first-class lever.
    • Recall the equation for mechanical advantage:
    • Use a calculator and the data from Table A to calculate the mechanical advantage.

Mechanical Advantage = Load Force ÷ Effort Force

  • Record the mechanical advantage due to force in Table A for each position of the fulcrum.
  • Describe how the changes in the position of the fulcrum affected the length of the effort arm and load arm. 
  • How did the change in the position of the fulcrum affect the load force? 
  • How did the change in the position of the fulcrum affect the effort force? 
  • How did the change in length of the effort arm affect the effort force? 
  • How did the change in the length of the load arm affect the effort force? 
  • Calculate: Determine the mechanical advantage due to the lengths of the effort arm and load arm and record them in Table A. Use the following formula:

Mechanical Advantage = Effort Arm Length ÷ Load Arm Length

  • Compare the mechanical advantage due to distance to the mechanical advantage due to force. Were they the same? Why or why not? 

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Note: The following Analysis Questions are for Trials 5-8. Table B is located below for reference.

  • Calculate: Determine the mechanical advantage for force and distance for each position of the fulcrum on the second class lever. Record your results in Table B.

Mechanical Advantage = Load Force ÷ Effort Force

Mechanical Advantage = Effort Arm Length ÷ Load Arm Length

  • How did the changes in the position of the load affect the length of the effort arm and load arm? 
  • How did the change in the position of the load affect the load force and effort force? 

SM Inv 2 PostLab Compare Trials 5-8

  • Compare the effort required to lift the load in this trial to Trials 5, 6, and 7. Did it feel easier or harder to lift the load in this trial? Why? 

SM Inv 2 PostLab Conclusions Trials 5-8

  • Study the data in Table A. How did changing the position of the fulcrum affect mechanical advantage? Why? 
  • Study the data in Table B. How did changing the position of the load affect mechanical advantage? Why? 
  • Do all levers give the same mechanical advantage? Use your data to support your answer. 

GET FOCUSED

Complete the Focus Questions in your SDR then discuss them as a class. 

  • How can simple machines change the force needed to lift a load? 
  • How does the relationship between the fulcrum, effort, and load affect the force needed to lift a load? 
  • How does mechanical advantage relate to effort and load forces and the lengths of effort and load arms?