Home+Work.

= = 1. 1.  Phospholids, proteins, carbohydrates 2. 2. The phosphalids are packed tightly against each other, the hydrophilic are next to each other, the hydrophobic, are connected to another hydrophobic on the other side, where the hydrophilic are packed together again 3. 1. They act like gates. 2. They help control chemical reactions 3. They help cells communicate

4. The carbohydrates allow different types of cells recognize each other. = =

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

Hypothesis If the effort force is close to the fulcrum, then it requires more force to move the resistance force. Because the effort required to lift something close to you is less then something far away from you.

Variables Independent: The load’s mass. Dependent: The amount of force. Controlled:

Materials: Ruler, Pencil, Weight, GTX EXPLORER™

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 see-saw, 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 newtons 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:**


 * 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 cm || 100 g || 49 cm || 1.0 N || 49 cm ||
 * 50 cm || 100 g || 49 cm || 1.5 N || 49 cm ||
 * 50 cm || 100 g || 49 cm || 1.6 N || 49 cm ||
 * 50 cm || 100 g || 49 cm || 1.4 N || 49 cm ||

Try these other fulcrum placements and find several effort placements that will work.


 * Fulcrum At (cm) || Load at End of Ruler (g) || Load distance (cm) (from fulcrum to load) || Effort Force needed (newtons) || Effort F

orce Distance (cm) || Conclusion: Our hypothesis was correct, but our experiments might not have been accurate because multiple different people recorded different results. other then that factor, i believe that i did well, and hat it was a success. but i do not believe that our hypothesis is correct, and might someday prove myself wrong.
 * 40 cm || 100 g || 40 cm || 0.3 N || 60 cm ||
 * 40 cm || 100 g || 40 cm || 0.6 N || 50 cm ||
 * 40 cm || 100 g || 40 cm || 3.5 N || 10 cm ||
 * 40 cm || 100 g || 40 cm || 1.2 N || 30 cm ||
 * 30 cm || 100 g || 30 cm || <0.1 N || 70 cm ||
 * 30 cm || 100 g || 30 cm || 0.1 N || 50 cm ||
 * 30 cm || 100 g || 30 cm || 0.5 N || 20 cm ||