Levers

Levers PowerPoint PPT Presentation


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Driving Questions. How can a lever make work easier?What happens to the effort needed to lift a load as the position where the effort is applied changes?What happens to the effort needed to lift a load as the position of the load changes?How many ways can you arrange the fulcrum, load, and effort in a lever system?What classes of levers can we find in the real world and how do people use them to make work easier?.

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Levers

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1. Levers SCI 201

2. Driving Questions How can a lever make work easier? What happens to the effort needed to lift a load as the position where the effort is applied changes? What happens to the effort needed to lift a load as the position of the load changes? How many ways can you arrange the fulcrum, load, and effort in a lever system? What classes of levers can we find in the real world and how do people use them to make work easier?

3. How can a lever make work easier? A couple of lever demos… Levers are used to lift things or overcome resistance. Levers give mechanical advantage by making work easier A lever arm is a stick or beam, free to pivot about a point The fulcrum is the point around which the lever arm pivots 4 parts of a lever: lever arm, fulcrum, effort, and load

6. Inquiry #1: What happens to the effort needed to lift a load as the position where the effort is applied changes? Can you lift the load using only one finger? Does it always take the same amount of effort to lift the load? Where should you press to lift the load with the least force? Be more systematic: What is the relationship between the load and effort that gives a lever user the greatest advantage (i.e. makes it easiest to lift the load)?

7. Inquiry #2: What happens to the effort needed to lift a load as the position of the load changes? What do you think would happen to the effort needed to lift the load if… the scale stayed at one location on the lever? the load moved further and further from the fulcrum? Be systematic: Find out if the result is the same as moving the location of the effort.

8. More About Levers How many ways can you arrange the fulcrum, load, and effort in a lever system? Classes of levers 1, 2, 3 What classes of levers can we find in the real world and how do people use them to make work easier?

9. Driving Questions How can a lever make work easier? What happens to the effort needed to lift a load as the position where the effort is applied changes? What happens to the effort needed to lift a load as the position of the load changes? How many ways can you arrange the fulcrum, load, and effort in a lever system? What classes of levers can we find in the real world and how do people use them to make work easier?

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