1. Static Friction TLSAMP Summer Science Academy 2005

2. Group 3 Members Keshia Ashley Walter Ayla

3. Objective Our objective is to investigate the coefficient of the static friction for wood on wood.

4. Hypothesis There must exist some resistive force opposite to the direction of motion between two surfaces in contact. Mean0.328913 Standard Deviation0.178564 T-statistic-0.57853 Degree of Freedom 23 P-value0.431474

5. Materials  Wooden Block  Wooden Board  String  Weights  Balance  Pulley  Vice

6. Procedures 1)Place a wooden board on top of a table top surface 2)Attach the pulley and vice, then bind it to the table top and board 3)Use balance to weigh the block and find its mass.(Represented as ) 4)Tie a piece of string around the wooden block 5)Make sure the string is long enough to extend across the pulley and hold the weights over the edge of the table

7. Procedures (Cont.) 6)Position the wooden block about 12 inches away from the pulley 7)Begin to add weights to the opposite end of the string (the purpose of this is to add enough weight to move the wooden block across the wooden board, thus creating static friction.) 8)Record your results. 9)Add 100g weight on top of the wooden block and complete the previous 6-9.

8. Definitions/Formulas Mb=Mass of block Mw=Mass of Weight M=Mass Coefficient of static is the added together and divided by m. f F N F=mg F=f f= Mg=

9. Data

10. Data (Cont.)

11. Hypothesis Testing 0.35 0.32 We failed to reject p-value = 0.43

12. Results According to our experiment the numerical coefficient of static friction is 0.35

13. Conclusion No matter how much weight we added to the wooden block, the coefficient of static friction was constant.