Energy Of Objects In Motion Energy Classwork
1Energy of Objects in MotionEnergyClasswork1. Define Energy.2. What are the two things necessary for work to be done on an object?3. How can you determine the amount of work is being done on an object?4. What would happen to an object’s velocity if positive work is done on an object?5. Based on the diagram below, is positive or negative work being done on the object?Explain.6. Based on the graph below, is positive or negative work being done on the object?Explain.7. A ball is dropped from the roof of the building. The ball initially had 100 J of Energy.Just as it landed it had 90 J or Energy. How much work was done on the ball as it fell?What did the work?8. What are the two major forms of Energy?9. What is the definition of Mechanical Energy?10. What is the definition of Non-Mechanical Energy?www.njctl.org8th Grade PSIEnergy of Objects in Motion
2Homework11. What would happen to an object’s velocity if no work was being done on the object?12. Based on the diagram below, is the object’s speed increasing or decreasing due to AirResistance. Explain in terms of work being done on the object.13. Based on the graph below, which of the following is being done: positive work, negativework, no work. Explain.14. At what time on the graph below does the object start to experience negative work beingdone on it? Explain.15. An adult is driving a car which has 50 J of Energy. At the end of the drive the car stillhad 50 J of energy. How much work was done on the car during the drive?www.njctl.org8th Grade PSIEnergy of Objects in Motion
316. What are the two forms of Mechanical Energy?17. Name two forms of Non-Mechanical Energy.Kinetic EnergyClasswork18. What two factors does Kinetic Energy depend upon?19. If an object is accelerating, how does its Kinetic Energy change?20. If a mouse and an elephant have the same kinetic energy, can you determine which one isrunning faster? Explain.21. If an object’s speed is doubled, how does its Kinetic Energy change?22. If the mass of an object is doubled, how does its Kinetic Energy change?23. How much kinetic energy does an 80 kg man have while running at 3 m/s?24. A 6 kg object has a speed of 20 m/s. What is its kinetic energy?25. A 1000 kg car’s velocity increases from 5 m/s to 10 m/s. What is the change it the car’skinetic Energy?Homework26. What is the SI unit for Kinetic Energy?27. When is the only time that an object has no Kinetic Energy?28. If an object is decelerating, how does its Kinetic Energy change?29. If an object’s speed is cut in half, how does its Kinetic Energy change?30. If the mass of an object is cut in half, how does its Kinetic Energy change?31. How much kinetic energy does a 4 kg cat have while running at 9 m/s?32. A 2 kg watermelon is dropped from a roof and is traveling with a speed of 5 m/s justbefore it hits the ground. How much Kinetic Energy does the watermelon have at thismoment?33. A 700 kg horse is running with a velocity of 5 m/s. How much larger is the horse’sKinetic Energy compared to a 100 kg man running at the same speed?Gravitational Potential EnergyClasswork34. What three factors does Gravitational Potential Energy depend upon?35. If an object is thrown up in the air, how does its Gravitational Potential Energy change?36. If an object is falling, how does its Gravitational Potential Energy change?37. How does your Gravitational Potential Energy change if you are placed on the moonwhere gravity is lower than on Earth?www.njctl.org8th Grade PSIEnergy of Objects in Motion
438. If the mass of an object is cut in half, how does its Gravitational Potential Energychange?39. A 1 kg ball is thrown up in the air and reaches a height of 5 m. What is its GravitationalPotential Energy at that moment?40. A 200 kg boulder is sitting on top of a 10 m high hill. What is the boulder’s GravitationalPotential Energy?41. What is the gravitational potential energy of a 450 kg car at the top of a 25 m parkinggarage?42. A 2.0 kg toy falls from 2 m to 1 m. What is the change in GPE?43. A small, 3 kg weight is moved from a height of 5 m to a height of 8 m. What is thechange in potential energy?Homework44. What is the SI unit for Gravitational Potential Energy?45. When is the only time that an object has no Gravitational Potential Energy?46. How does your Gravitational Potential Energy change if you are placed on Jupiter wheregravity is larger than on Earth?47. If the mass of an object is doubled, how does its Gravitational Potential Energy change?48. A 75 kg skydiver is spotted at a height of 1000 m above the Earth’s surface. How muchGravitational Potential Energy does the skydiver possess?49. A placekicker in football is attempting a field goal and kicks a 0.75 kg football which hitsthe crossbar that is 3.1 m tall. How much Gravitational Potential Energy does the ballhave when it hits the crossbar?50. The “Green Monster” is the name for the left field wall at Fenway Park and is 11.33 mtall. How much Gravitational Potential Energy does a 0.2 kg baseball have when it justclears the wall?51. An 80 kg person falls 60 m off of a waterfall. What is her change in GPE?52. A 0.25 kg book falls off a 2 m shelf on to a 0.5 m chair. What was the change in GPE?Elastic Potential EnergyClasswork53. What two factors does Elastic Potential Energy depend upon?54. Define the term spring constant?55. The same spring is stretched by 1 meter and then compressed by 1 meter. In which casewill the spring have more Elastic Potential Energy stored in it? Explain.56. Two identical springs are stretched. Spring A is stretched 1 meter while spring B isstretched 2 meters. Which spring will have more Elastic Potential Energy stored in it?Explain.www.njctl.org8th Grade PSIEnergy of Objects in Motion
557. If a spring is stretched twice as far (as in #56), how many times larger is the ElasticPotential Energy that is stored in it?58. A spring with a spring constant of 500 N/m is stretched 1 meter in length. How muchElastic Potential Energy does the spring have stored in it?59. A spring with a spring constant of 250 N/m is stretched 0.5 meters. How much ElasticPotential Energy does the spring have stored in it?60. A spring with a spring constant of 100 N/m is compressed by 0.25 meters. How muchElastic Potential Energy does it have stored in it?Homework61. Define the term “Relaxed Length”.62. Two springs are stretched to the same distance. If spring A has a spring constant of 200N/m and spring B has a spring constant of 400 N/m, which spring has more ElasticPotential Energy stored in it? Explain.63. A spring with a spring constant of 100 N/m is not stretched. How much Elastic PotentialEnergy does the spring have stored in it?64. A spring with a spring constant of 200 N/m is stretched 1 meter in length. How muchElastic Potential Energy does the spring have stored in it?65. A spring with a spring constant of 500 N/m is compressed 0.5 meters. How much ElasticPotential Energy does the spring have stored in it?66. A rubber band with a spring constant of 150 N/m is stretched by 0.25 meters. How muchElastic Potential Energy does it have stored in it?Conservation of EnergyClassworkQuestions 67 – 70 refer to the diagram below67. At which position does the block have maximum Gravitational Potential Energy?Explain.68. At which position does the block have maximum Elastic Potential Energy? Explain.www.njctl.org8th Grade PSIEnergy of Objects in Motion
669. At which position does the block have maximum Kinetic Energy? Explain.70. At which position does the block have maximum Total Energy? Explain.Questions 71 – 74 refer to the diagram below71. At which position does the man have maximum Gravitational Potential Energy? Explain.72. At which position does the man have maximum Elastic Potential Energy? Explain.73. At which position does the man have maximum Kinetic Energy? Explain.74. At which position does the man have maximum Total Energy? Explain.HomeworkQuestions 75-78 refer to the diagram below75. At which position does the ball have maximum Gravitational Potential Energy? Explain.76. At which position does the ball have maximum Elastic Potential Energy? Explain.77. At which position does the ball have maximum Kinetic Energy? Explain.78. At which position does the ball have maximum Total Energy? Explain.Questions 79-82 refer to the diagram belowwww.njctl.org8th Grade PSIEnergy of Objects in Motion
779. At which position does the car have maximum Gravitational Potential Energy? Explain.80. At which position does the car have maximum Elastic Potential Energy? Explain.81. At which position does the car have maximum Kinetic Energy? Explain.82. At which position does the car have maximum Total Energy? Explain.Types of Energy ResourcesClasswork83. Define Renewable Resource.84. Define Non-Renewable Resource.85. List two examples of a Renewable Energy Resource.86. List two examples of a Non-Renewable Energy Resource.Homework87. How does a turbine convert Kinetic Energy of its source into Electrical Energy?88. How does a hydroelectric power plant transfer both Potential and Kinetic Energy intoElectric Energy?89. What type of Energy resource does not use a turbine to convert Mechanical Energy intoElectrical Energy?90. Why are Fossil Fuels considered to be non-renewable energy resources?91. Why are Fossil Fuels not considered clean energy resources?www.njctl.org8th Grade PSIEnergy of Objects in Motion
8Answers:1) Energy is the ability to do work.2) An applied force and a displacement.3) Work is the product of the force applied and the displacement of the object.4) It would increase5) Positive, the force applied is in the direction of the displacement6) positive, the object is accelerating7) 10 J, the air through air resistance8) Mechanical and Non-Mechanical9) The energy of an object due to its position or motion.10) The energy of an object that is not due to its position or motion, but rather is energy at theatomic level.11) It would remain constant12) Air resistance is doing work against the man’s displacement (negative work) and thereforecausing the velocity to decrease.13) No work is being done because the velocity is constant.14) Negative work is being done because the velocity is decreasing.15) 0 J16) Potential and Kinetic energy17) Electric and Nuclear energy18) mass and velocity19) it increases20) Since the mouse has less mass than the elephant, it has to have a larger velocity in order tohave the same kinetic energy.21) 4 times larger22) it is doubled23) 360 J24) 1,200 J25) 37.500 J26) Joule (J)27) when the object is not moving (velocity equals 0)www.njctl.org8th Grade PSIEnergy of Objects in Motion
928) it decreases29) it reduces by four times30) it is cut in half31) 162 J32) 25 J33) 7 times larger34) mass, gravity, and weight35) increases36) decreases37) decreases38) cut in half39) 49 J40) 19,600 J41) 110, 250 J42) 19.6 J43) 88.2 J44) Joules (J)45) when the height is zero46) increases47) doubled48) 735,000 J49) 22.8 J50) 22.2 J51) 47, 040 J52) 3.7 J53) The spring constant and the amount that the spring is stretched or compressed.54) The “elasticity” of an object (how much an object stretches when an amount of force isapplied).55) Neither, both will have the same amount of potential energy.56) The spring stretched 2X will have 4X more Elastic Potential Energy since the distance ofstretch is squared.www.njctl.org8th Grade PSIEnergy of Objects in Motion
1057) 4X58) 250 J59) 31.3 J60) 3.1 J61) The length of a spring when it is not stretched62) B – spring constant is twice as large63) 0 J64) 100 J65) 62.5 J66) 4.7 J67) A – it is at the highest height68) None – there is no spring that is stretched or compressed69) B – it will be going the fastest because it is at the lowest point70) All points have the same Total Energy71) 3 – the person is at the highest point72) 1 – the springs are stretched the most73) 2 – the person is going the fastest when he leaves the trampoline74) All points have the same Total Energy75) ho – it has the highest height76) None – there is no spring that is stretched or compressed77) at the point of contact between h0 and h1 because it is falling from the highest height78) All points have the same Total Energy79) A – it is at the highest height80) None – there is no spring that is stretched or compressed81) B – it is at the lowest point and all GPE from A is converted into KE82) All points have the same Total Energy83) Energy resources that replenish themselves in a timely manner.84) Energy resources that exist in limited supply and cannot be replenished in a timey manner85) Wind. Solar, Water, Biomass, Geothermal86)Fossil fuels and nuclear energy.87) As the turbine moves it creates kinetic energy.www.njctl.org8th Grade PSIEnergy of Objects in Motion
1188) As the water falls from it converts from gravitational potential energy into kinetic energy.As the water flows by the turbine it moves the turbine doing work and creating electricity.89) Solar Energy90) Because the amount of time it takes to produce fossil fuels is much larger compared to theamount of time it takes to consume fossil fuels,91) Because Carbon Dioxide is produced when it is burned.www.njctl.org8th Grade PSIEnergy of Objects in Motion
Kinetic Energy Classwork 18. What two factors does Kinetic Energy depend upon? 19. If an object is accelerating, how does its Kinetic Energy change? 20. If a mouse and an elephant have the same kinetic energy, can you determine which one is running faster? Explain. 21. If an object’s speed is doubled,
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Motion Capture, Motion Edition - lionel.reveret@inria.fr 38 Motion capture, Motion edition References – "Motion Warping,“, Zoran Popovic, Andy Witkin in Com puter Graphics (SIGGRAPH) 1995. – Michael Gleicher. “Retargetting Motion to New Chara cters”, Proceedings of SIGGRAPH 98. In Computer Graphics Annual Conferance Series. 1998.
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