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LAB #6

LAB #6. Newton’s 2 nd Law. GOALS. 1 TO TEST THE FACTORS WHICH DETERMINE ACCELERATION a vs net FORCE a vs MASS (m). Photogate. m. m. cart. cart. cart. cart. D. m. m. m. m. D. m. Hanging mass(es). W. Passenger masses. PART A: a vs. net F. m. Vo = 0. m.

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LAB #6

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  1. LAB #6 Newton’s 2nd Law

  2. GOALS 1 TO TEST THE FACTORS WHICH DETERMINE ACCELERATION a vs net FORCE a vs MASS (m)

  3. Photogate m m cart cart cart cart D m m m m D m Hanging mass(es) W Passenger masses PART A: a vs. net F m Vo = 0 m Hanging mass(es) m W Vo = 0

  4. PROCEDURE • PART A: a vs F net • SET UP CART ON RAMP, LEVEL RAMP • POSITION PHOTOGATE ON RAMP, RECORD D • LOAD CART WITH PASSENGER MASSES, m • SELECT A PASSENGER MASS • ATTACH SELECTED TO END OF STRING • RELEASE CART FROM REST • RECORD PHOTOGATE TIME • DETERMINE a • TRANSFER MORE PASSENGER MASS TO HANGING MASS, KEEPING TOTAL MASS CONSTANT. • REPEAT TRIAL

  5. DATA TABLE A MASS ON SCALE CART + ALL masses HANGING MASS

  6. GRAPH #1: a vs Fnet ACCELERATION (m/s2) NET FORCE (N)

  7. PROCEDURE • PART B:a vs MASS (M) • CONSTRUCT I.P. SIMULATION • KEEP Fnet CONSTANT (hanging mass) • RELEASE CART FROM REST • STOP SIM BEFORE ACCEL STOPS! • MEASURE t AND d OF TRAVEL • INCREASE MASS OF CART • REPEAT FOR 8-10 TRIALS

  8. LAB #6: I.P. SIMULATION Vo = 0 Fnet D Fg m = 0 Fg is Fnet Fnet = ? tf = _____ When do you stop the SIM? Use ruler to measure D

  9. HANGING MASS DATA TABLE B WEIGHT OF HANGING MASS

  10. GRAPH #2: a vs mass ACCELERATION (m/s2) MASS (kg)

  11. GRAPH #3 : a vs INVERSE OF MASS ACCELERATION (m/s2) INVERSE OF MASS (kg)

  12. WRITE-UP • ABSTRACT: • BACKGROUND • METHOD • SKETCH: ENHANCED I.P. SCREEN DUMP • DATA TABLES • GRAPHS • TRENDLINES • GRAPH ANALYSIS • TEXT BOX TO TELL STORY OF EACH GRAPH • INCLUDE SIGNIFICANCE OF SLOPE OF LINEAR TRENDLINES • CONCLUSION

  13. LAB #6 DATA ANALYSIS

  14. a M m a Fnet = ma Theoreticala N T T Mg T > mg mg N = Mg Fnet = mg - T Fnetis T mg – T = ma T = Ma

  15. T = Ma + a = mg (m+M) Theoreticala (cont.) Add the equations T = Ma mg – T = ma mg = ma + Ma mg = a (m+M)

  16. 1 1 m m GRAPH #1: a vs Fnet a a Fnet Slope = ? Fnet = m a ( ) ACCELERATION (m/s2) a = Fnet b = 0 Y = (m)x + b FORCE (N)

  17. GRAPH #2: a vs mass a a 1/mn n = 1,2,? ACCELERATION (m/s2) MASS (kg)

  18. 1 m GRAPH #3 : a vs INVERSE OF MASS aa 1/m Slope = ? Fnet Fnet = m a ( ) ACCELERATION (m/s2) a = (Fnet) b = 0 Y = (m)x + b INVERSE OF MASS (kg)

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