Lever+Lab

Questions: **How is effort force affected when applied closer to the fulcrum?**
 * Lever Lab **

Hypothesis: **If the effort force distance is decreased then the effort force needed will raise because it needs more effort if it is closer to the fulcrum.**

Materials: **Meter Stick, Pencil, Data collector, Weight**

Variables: Procedure:
 * Fulcrum, weight and effort force distance **
 * 1. The smaller end of the meter stick will be for the load force. (The 0cm end). This means that the load you are trying to lift should be at this end. **
 * 2. The larger end of the meter stick (the 100-cm end) will be for the effort force. **
 * 3. Set up your lever like a meter stick with no weights, and the fulcrum close to the middle so the lever acts like a seesaw, balanced in the middle. **
 * 4. Put a load of 50 g at the LOAD END of the lever. Put the load as close as possible to the end of the lever. Be careful that the fulcrum stays in place. **
 * 5. Apply a force by pushing the Force Sensor down on the FORCE END of the lever. Add just enough to lift the load. **
 * 6. Record the Newton you need to lift the load. (I've done this one as an example below). **
 * 7. Repeat steps 4- 6 changing the Effort Force Distance. **
 * 8. Record the data in the data table. **

Try these other fulcrum placements and find several effort placements that will work.
 * Data Table **
 * Fulcrum At (cm) || Load at End of Ruler (g) || Load distance (cm) (from fulcrum to load) || Effort Force needed (newtons) || Effort Force Distance (cm) ||
 * 50 || 40 || 49 || 1.0 || 49 ||
 * 50 || 40 || 49 || .5 || 49 ||
 * 50 || 40 || 49 || .7 || 30 ||
 * 50 || 40 || 49 || 1.1 || 20 ||


 * Fulcrum At (cm) || Load at End of Ruler (g) || Load distance (cm) (from fulcrum to load) || Effort Force needed (newtons) || Effort Force Distance (cm) ||
 * 40 || 90 || 39 || .3 || 59 ||
 * 40 || 90 || 39 || .4 || 50 ||
 * 40 || 90 || 39 || .5 || 40 ||
 * 40 || 90 || 39 || .6 || 30 ||
 * 30 || 130 || 29 ||  || 69 ||
 * 30 || 130 || 29 ||  || 65 ||
 * 30 || 130 || 29 ||  || 60 ||
 * 30 || 130 || 29 ||  || 60 ||

1. Compare the effort distance and the effort force in all trials. What happens to the amount of effort force as the effort distance increases? Use the terms “inverse” or “direct” in your answer.
 * When the distance of the effort force come closer, then the efforts force( Newton) get increase. When the effort force get farther, the force get inversed. **

2. What class of lever did this represent? Conclusion: I therefore conclude that **`**if the effort force distance is decreased then the effort force needed will raise because it needs more effort if it is closer to the fulcrum`.
 * First class lever **

Extension Design a similar experiment using a lever of a different class. Do your results change are they similar?



First Class Lever



Second Class Lever



Third Class Lever

** CRANE **

** Lab report guide **
 * __Question__ ** **–** when the effort force is move near the fulcrum, so the mass is increased or decreased.


 * __Hypothesis__** – if it requires more force to effort force, then the mass should increase, when it is near. Because, when the effort comes closer, it need more force to push.


 * __Independent Variable__**- effort force (distance)


 * __Dependent Variable__ ** - effort force needed (Newton)


 * __Controlled Variable__ ** - Load at End of Ruler (g), fulcrum

2. The larger end of the meter stick (the 100-cm end) will be for the effort force. 3. Set up your lever like a meter stick with no weights, and the fulcrum close to the middle so the lever acts like a seesaw, balanced in the middle. 4. Put a load of 50 g at the LOAD END of the lever. Put the load as close as possible to the end of the lever. Be careful that the fulcrum stays in place. 5. Apply a force by pushing the Force Sensor down on the FORCE END of the lever. Add just enough to lift the load. 6. Record the Newton you need to lift the load. (I've done this one as an example below). 7. Repeat steps 4- 6 changing the Effort Force Distance. 8. Record the data in the data table.
 * __Procedure__ ** –The smaller end of the meter stick will be for the load force. (The 0cm end). This means that the load you are trying to lift should be at this end.