1. Starter 1.Determine the kinetic energy of a 625-kg roller coaster car that is moving with a speed of 18.3 m/s. 2.If the roller coaster car in the above problem were moving with twice the speed, then what would be its new kinetic energy? 3.Missy Diwater, the former platform diver for the Ringling Brother's Circus, had a kinetic energy of 12 000 J just prior to hitting the bucket of water. If Missy's mass is 40 kg, then what is her speed? 4.What is the potential energy of a 20kg ball at the top of a 100 m building?

2. Answers 1.KE = 0.5*m*v 2 KE = (0.5) * (625 kg) * (18.3 m/s) 2 KE = 1.05 x10 5 Joules 2. KE = 0.5*m*v 2 12 000 J = (0.5) * (40 kg) * v 2 300 J = (0.5) * v 2 600 J = v 2 v = 24.5 m/s 3.If the speed is doubled, then the KE is quadrupled. Thus, KE = 4 * (1.04653 x 10 5 J) = 4.19 x 10 5 Joules or KE = 0.5*m*v 2 KE = 0.5*625 kg*(36.6 m/s) 2 KE = 4.19 x 10 5 Joules 4.PE=mgh PE= (20kg)(9.8m/s 2 )(100m) PE= 19600 J

3. Mechanical Energy Lab Day 32

4. Lab Rules There will be no misconduct! That includes throwing any objects. Listen carefully to my instructions so that your lab can be done in a safe manner. Failure to follow the rules results in a zero!

5. Materials Marble Tennis Ball Golf Ball Meter stick Stop Watch

6. Procedure Part 1 You will calculate the potential energy of each object at varying heights.

7. Procedure Part 2 You will simply drop the objects from Part One from a variety of locations. Fill in the data tables below to determine both the P.E. and K.E. for each situation.

8. Graph Construct a line graph for the marble and golf ball in the space provided. This graph should contain four lines with a color-coded key. Don’t forget to label the x-axis and y-axis with an appropriate scale and give the graph a descriptive title.

9. Analysis Answer these questions on a separate sheet of paper and staple it to your lab sheet. 1.When was the potential energy the highest in this experiment and why? 2.When was the kinetic energy the highest in this experiment and why? 3.In theory, the potential energy at the top of the drop should match the kinetic energy at the bottom of the drop for each trial. Did all of the potential energy transfer to kinetic energy in your test? Does this mean you lost/gained any energy? Explain using the law of conservation of energy. 4.Was this experiment perfect? Explain some possible sources of error. 5.Which has a greater effect on the kinetic energy of an object…mass or velocity? Why? 6.Would the golf ball have more or less potential energy on the moon than it does on earth? Why?

10. Exit Slip Please Finish the lab! Make sure to turn it in and the answered questions.

11. Quiz Please put away everything but your pencil!