Conservation of Energy Activity Physical Science

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Sophia Singleton
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1 Conservation of Energy Activity Physical Science Name: Period: Date: Essential Question: How do I analyze and apply the principle of conservation of energy? MATERIALS: Meter stick, tape measure, golf ball, and calculator Instructions: 1. Calculate the weight of the golf ball. The mass of the golf ball is 45.0 grams. 2. Drop the golf ball from a certain height, record this height in Table, and calculate for the gravitational potential energy ( GPE). 3. Measure the bouncing heights of the golf ball and record them on the succeeding tables. Table 1: Mass and Weight of the Golf Ball Mass of golf ball in gram Use the digital weighing scale to determine the mass (g) of the golf ball. Mass of golf ball in kilogram Convert gram to kilogram. 1 kg=1000 g Weight of golf Ball in Newton g= 9.8 m/s/s Use to solve for weight Fg = mg 45.0 g Height from which. ( m) Solve for the Gravitational Potential Energy (GPE) using the equation: GPE= mgh Table 2: First Trial: Name of student who dropped the golf ball: Name of the student who measured the height: Name of the student who recorded the data: Table 3: Second Trial: Name of student who dropped the golf ball: Name of the student who measured the height: Name of the student who recorded the data:

2 Table 4: Third Trial: Name of student who dropped the golf ball: Name of the student who measured the height: Name of the student who recorded the data: 4. Calculate and record the average heights of the 3 trials. Simply add all 3 heights of the at which dropped divided by 3 and record your average under the first column of the table below. Do the same with the first, second, third, fourth bounce. Table 5: Averaging Name of Student/s who did the averaging: at which the golf ball was dropped in of First Bounce in of Second of Third Bounce in of Fourth Bounce in 5. Find the Gravitational Potential Energy ( GPE ) using below. Equation for Gravitational Potential Energy: Table 6: First bounce GPE of First Bounce in Where: GPE is gravitational potential energy =Joules m is for mass=kg g is earth accelerationg gravity= h is height = meter Table 7: Second bounce GPE of Second

3 Table 8: Third bounce GPE of Third Bounce in Table 9: Fourth bounce GPE of Fourth Solve for the GPE using 6. Suppose that the velocity of the golf ball 6.2 m/s. Calculate the Kinetic Energy ( KE ), in Joules? Use below to find the Golf ball s kinetic energy. KE =1/2mv 2 Where: KE is kinetic energy in Joules m is mass in kilograms v is velocity in meter per second Table 10: Kinetic Energy Table Mass of the golf ball in kilograms (kg) You already got this in Table 1 Velocity of golf ball free fall in meter per second (m/s) velocity = 2gh Kinetic Energy of the golf ball KE =1/2mv 2 (Joules or N-m) GPE value from Table 1 ( Joules or N-m) 6.2 m/s Clarifying Questions: 1. How is the Gravitational Potential Energy ( GPE ) affected by height? Look at your Table 1 to answer this question.

4 2. Does the mass of the golf ball affect its Gravitational Potential Energy? Explain. Look at your Table 1 to answer this question. 3. How can you increase the Gravitational Potential Energy of the golf ball? Think! 4. Explain the reason/s for the decreasing bouncing heights of the golf ball? Study your table 1 to 5 to answer this. 5. Explain this. Why do some balls bounce higher and longer than other balls? Research and Think! 6. How do your gravitational potential energy and kinetic energy compare? You can answer this question by comparing your table 1 and table How do you explain the Law of Conservation of Energy? Review and Think! 8. How is gravitational potential energy defined? Review and Think! 9. How is kinetic energy defined? Review and Think! 10. Why do things on earth do not fall at the same rate? Explain. Identifying Units: You can use the choices more than once. 1. Joules a. kilogram 2. Height b. kg -m 3. Mass c. 4. GPE d. kg or Newton 5. KE e. meter 6. Weight or Fg

5 1. b 2. e 3. a 4. b 5. b 6. d

Potential / Kinetic Energy Remedial Exercise

Potential / Kinetic Energy Remedial Exercise This Conceptual Physics exercise will help you in understanding the Law of Conservation of Energy, and its application to mechanical collisions. Exercise Roles: