LM CH 6 Lab

Choose one of the unknown masses and do simulation. After you find a displacement, find an unknown mass using a graph above and the obtained spring constant. Unknown mass (m) = __ 0.74 _ kg 3. Procedure  Set the initial point at zero of scale.  Set the Spring Constant.  Set the Damping to None.  Set the Mass as below.  Take the stopwatch from your cellphone.  Now oscillate the spring and measure time of ten oscillations.  Repeat the above step for unknown mass. 4. Observations and Calculations No. Mass ( m ) kg Time for 10 oscillation (t) s Periodic time (T =t/10) s Square the period (T 2 ) 1 0.1 kg 6.39 0.693 0.48 2 0.15 kg 7.72 .772 .60 3 0.2 kg 8.96 0.896 .80 4 0.25 kg 9.96 0.996 0.99 5 0.3 kg 10.88 1.088 1.18 6 Unknown mass 12.11 1.211 1.47 Make a graph for T 2 vs mass using above 5 mass data and Excel, and find a slope which is 4 π 2 / k . a) Graph 3

A. KE depends on position and PE g depends on motion B. KE depends on motion and PE g depends on position. C. Although both energies depend on motion, only KE depends on position D. Although both energies depend position, only PE g depends on motion 2. As any object free falls, the gravitational potential energy Ans: C __ A. vanishes B. is immediately converted to kinetic energy C. is converted into kinetic energy gradually until it reaches the ground Questions 3-6: A spring is hanging from a fixed wire as in the first picture on the left. Then a mass is hung on the spring and allowed to oscillate freely (with no friction present) . Answers A-D show different positions of the mass as it was oscillating. 3. Where does the spring have maximum elastic potential energy? Ans: _ C __ 4. Where is the gravitational potential energy the least? Ans: __ B _ 5. Where is the kinetic energy zero? Ans: _ B and C _ 6. Where is the elastic potential energy zero? Ans: _ A __ 6