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# Levers[1]001

## on Dec 19, 2009

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levers, palancas

levers, palancas

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• Use navigation buttons rather than mouse click to navigate through the presentation.
• Question pupils as to what is the common factor of these simple machines.
• Have examples of scissors and other levers at hand to extend above examples
• Question pupils as to what would happen if we placed a 5Kg weight at 1 or 2m? Then click on 1m or 2m button as appropriate!
• Run through why this scenario balances.
• Introduce term “turning effect”
• Give examples on board of calculations using this formula.
• Introduce terms Effort and Load.
• Explain why this pair of scissors is a lever.
• Have pupils choose which length of plank they could use to make the 5Kg weight lift the Sumo wrestler. When you have a consensus then click on the “Long” or “Short” plank button to see whether the pupil’s choose was right or wrong.
• Have pupils explain why this is the correct choice!
• Have pupils explain why this is an incorrect choice!
• Run through key words again!
• Presentation could be extended to cover the three types of levers in more depth (or better still with practical work) i.e., effort or distance magnifiers with emphasis of the position of the load and effort.

## Levers[1]001Presentation Transcript

• Levers Just a simple machine balancing on a pivot
• Examples of Levers What do all these have in common?
• Examples of Levers Pivot
• How Do Levers Work? 2m away from pivot 2m 1m 5Kg
• How Do Levers Work? 5Kg 5Kg The weights balance each other! 2m away from pivot 2m away from pivot 5 x 2 = 5 x 2
• How Do Levers Work? 5Kg 5Kg This is the turning effect! 2m away from pivot 1m away from pivot
• How Do Levers Work? Force = Distance X Weight F = d X W