Slide 1 / 113. Slide 2 / th Grade. Energy of Objects in Motion Classwork-Homework Slide 3 / 113. Classwork #1: Energy
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1 Slide 1 / 113 Slide 2 / 113 8th Grade Energy of Objects in Motion Classwork-Homework Slide 3 / 113 Classwork #1: Energy
2 1 Define Energy. Slide 4 / What two things are necessary for work to be done on an object? Slide 5 / How can you determine the amount of work done on an object? Slide 6 / 113
3 4 What would happen to an object s velocity if positive work was done on an object? Slide 7 / Based on the diagram below, is positive or negative work being done on the object? Explain. Slide 8 / Based on the graph below, is positive or negative work being done on the object? Explain. Slide 9 / 113
4 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. a. How much work was done on the ball as it fell? b. What did the work? Slide 10 / What are the two major forms of energy? Slide 11 / What is the definition of mechanical energy? Slide 12 / 113
5 10 What is the definition of non-mechanical energy? Slide 13 / 113 Slide 14 / 113 Homework: Energy 11 What would happen to an object s velocity if no work was done on the object? Slide 15 / 113
6 12 Based on the diagram below, is the person s speed increasing or decreasing due to air resistance. Explain in terms of work being done on the person. Slide 16 / At what time on the graph below does the object start to experience negative work being done on it? Explain. Slide 17 / An adult is driving a car which has 50 J of energy. At the end of the drive, the car still had 50 J of energy. How much work was done on the car during the drive? Slide 18 / 113
7 15 What are the two forms of mechanical energy? Slide 19 / Name two examples of non-mechanical energy. Slide 20 / 113 Slide 21 / 113 Classwork #2: Kinetic Energy
8 17 What two factors does kinetic energy depend upon? Slide 22 / If an object is accelerating, how does its kinetic energy change? Justify your answer. Slide 23 / If a mouse and an elephant have the same kinetic energy, can you determine which one is running faster? Explain. Slide 24 / 113
9 20 If an object s speed is doubled, how does its kinetic energy change? Slide 25 / If the mass of an object is doubled, how does its kinetic energy change? Slide 26 / How much kinetic energy does an 80 kg man have while running at 3 m/s? Show your work. Slide 27 / 113
10 23 A 6 kg object has a speed of 20 m/s. What is its kinetic energy? Show your work. Slide 28 / A 1000 kg car s velocity increases from 5 m/s to 10 m/s. What is the change it the car s kinetic energy? Show your work. Slide 29 / What is the SI unit for kinetic energy? Slide 30 / 113
11 Slide 31 / 113 Homework: Kinetic Energy 26 When is the only time that an object has no k inetic energy? Slide 32 / If an object is decelerating, how does its kinetic energy change? Slide 33 / 113
12 28 How can a more massive object have the same kinetic energy as a less massive object? Slide 34 / If an object s speed is cut in half, how does its kinetic energy change? Slide 35 / If the mass of an object is cut in half, how does its kinetic energy change? Slide 36 / 113
13 31 How much kinetic energy does a 4 kg cat have while running at 9 m/s? Show your work. Slide 37 / A 2 kg watermelon is dropped from a roof and has a speed of 5 m/s just before it hits the ground. How much kinetic energy does the watermelon have at this moment? Show your work. Slide 38 / A 700 kg horse is running with a velocity of 5 m/s. How much larger is the horse s kinetic energy compared to a 100 kg man running at the same speed? Slide 39 / 113
14 Slide 40 / 113 Classwork #3: Gravitational Potential Energy 34 What three factors does gravitational potential energy depend upon? Slide 41 / If an object is thrown up in the air, how does its gravitational potential energy change? Explain. Slide 42 / 113
15 36 If an object is falling, how does its gravitational potential energy change? Explain. Slide 43 / How does your gravitational potential energy change if you are placed on the moon where gravity is lower than on Earth? Slide 44 / If the mass of an object is cut in half, how does its gravitational potential energy change? Slide 45 / 113
16 39 A 1 kg ball is thrown up in the air and reaches a height of 5 m. What is its gravitational potential energy at that moment? Show your work. Slide 46 / A 200 kg boulder is sitting on top of a 10 m high hill. What is the boulder s gravitational potential energy? Show your work. Slide 47 / What is the gravitational potential energy of a 450 kg car at the top of a 25 m parking garage? Show your work. Slide 48 / 113
17 42 A 2.0 kg toy falls from 2 m to 1 m. What is the change in GPE? Show your work. Slide 49 / A small, 3 kg weight is moved from a height of 5 m to a height of 8 m. What is the change in potential energy? Show your work. Slide 50 / 113 Slide 51 / 113 Homework: Gravitational Potential Energy
18 44 When is the only time that an object has no gravitational potential energy? Slide 52 / How does your gravitational potential energy change if you are placed on Jupiter where gravity is larger than on Earth? Slide 53 / If the mass of an object is doubled, how does its gravitational potential energy change? Slide 54 / 113
19 47 What is the SI unit for gravitational potential energy? Slide 55 / A 75 kg skydiver is spotted at a height of 1000 m above the Earth s surface. How much gravitational potential energy does the skydiver possess? Show your work. Slide 56 / A placekicker in football is attempting a field goal and kicks a 0.75 kg football. The football hits the crossbar that is 3.1 m tall. How much gravitational potential energy does the ball have when it hits the crossbar? Show your work. Slide 57 / 113
20 50 The Green Monster is the name for the left field wall at Fenway Park and is m tall. How much gravitational potential energy does a 0.2 kg baseball have when it just clears the wall? Show your work. Slide 58 / An 80 kg person falls 60 m off of a waterfall. What is her change in GPE? Show your work. Slide 59 / A 0.25 kg book falls off a 2 m shelf on to a 0.5 m chair. What was the change in GPE? Show your work. Slide 60 / 113
21 Slide 61 / 113 Classwork #4: Elastic Potential Energy 53 What two factors does elastic potential energy depend upon? Slide 62 / Define the term spring constant? Slide 63 / 113
22 55 The same spring is stretched by 1 meter and then compressed by 1 meter. In which case will the spring have more elastic potential energy stored in it? Explain. Slide 64 / Two identical springs are stretched. Spring A is stretched 1 meter while spring B is stretched 2 meters. Which spring will have more elastic potential energy stored in it? Explain. Slide 65 / If a spring is stretched three times as far, by what factor does its elastic potential energy change? Does it increase or decrease? Slide 66 / 113
23 58 A spring with a spring constant of 500 N/m is stretched 1 meter in length. How much elastic potential energy does the spring have stored in it? Show your work. Slide 67 / A spring with a spring constant of 250 N/m is stretched 0.5 meters. How much elastic potential energy does the spring have stored in it? Show your work. Slide 68 / A spring with a spring constant of 100 N/m is compressed by 0.25 meters. How much elastic potential energy does it have stored in it? Show your work. Slide 69 / 113
24 Slide 70 / 113 Homework: Elastic Potential Energy 61 What is meant when a spring has a "relaxed" length? Slide 71 / Two springs are stretched to the same distance. If spring A has a spring constant of 200 N/m and spring B has a spring constant of 400 N/m, which spring has more elastic potential energy stored in it? Explain. Slide 72 / 113
25 63 A spring with a spring constant of 100 N/m is not stretched. How much elastic potential energy does the spring have stored in it? Slide 73 / A spring with a spring constant of 200 N/m is stretched 1 meter in length. How much elastic potential energy does the spring have stored in it? Show your work. Slide 74 / A spring with a spring constant of 500 N/m is compressed 0.5 meters. How much elastic potential energy does the spring have stored in it? Show your work. Slide 75 / 113
26 66 A rubber band with a spring constant of 150 N/m is stretched by 0.25 meters. How much elastic potential energy does it have stored in it? Show your work. Slide 76 / 113 Slide 77 / 113 Classwork #5: Conservation of Energy Slide 78 / 113 Questions refer to the diagram below, which shows a block starting from rest at 30 m.
27 67 At which position does the block have maximum gravitational potential energy? Explain. Slide 79 / At which position does the block have maximum elastic potential energy? Explain. Slide 80 / At which position does the block have maximum kinetic energy? Explain. Slide 81 / 113
28 70 At which position does the block have maximum total energy? Explain. Slide 82 / Suppose the block has a mass of 10 kg. Show your work for the following questions. Slide 83 / 113 a. What is the block's kinetic energy at position B if its velocity is 19.8 m/s? b. What is the block's gravitational potential energy at position B? c. Using your answers from (a) and (b), determine the block's total energy at position B. Slide 84 / 113 Questions refer to the diagram below that shows a person jumping on a trampoline.
29 72 At which position does the person have maximum gravitational potential energy? Explain. Slide 85 / At which position does the trampoline have maximum elastic potential energy? Explain. Slide 86 / At which position does the person have maximum kinetic energy? Explain. Slide 87 / 113
30 75 At which position does the person have maximum total energy? Explain. Slide 88 / 113 Slide 89 / 113 Homework: Conservation of Energy Questions refer to the diagram below which shows a ball dropped from rest at a height of h 0. Slide 90 / 113
31 76 At which position does the ball have maximum gravitational potential energy? Explain. Slide 91 / At which position does the ball have maximum elastic potential energy? Explain. Slide 92 / At which position does the ball have maximum kinetic energy? Explain. Slide 93 / 113
32 79 At which position does the ball have maximum total energy? Explain. Slide 94 / The amount of total energy the ball possesses is 0.14 J. The mass of the ball is kg. Use this information to answer the following: Slide 95 / 113 a. How much gravitational potential energy does the ball possess at h 1= 1.5 m? Show your work. b. How much kinetic energy does the ball possess at h 1= 1.5 m? Show your work. (Hint: Use the total energy and GPE of the ball.) Slide 96 / 113 Questions refer to the diagram below, which shows a roller coaster cart that starts from rest at a height of 30m.
33 81 At which position does the car have maximum gravitational potential energy? Explain. Slide 97 / At which position does the car have maximum elastic potential energy? Explain. Slide 98 / At which position does the car have maximum kinetic energy? Explain. Slide 99 / 113
34 84 Where does the car have both GPE and KE, but more GPE? Explain. Slide 100 / At which position does the car have maximum total energy? Explain. Slide 101 / The car has a mass of 500 kg and moves with a speed of 9.9 m/s at position C. What is the total energy of the car? (Hint: the car possesses KE and GPE at position C. Also remember that TE is the sum of KE and PE.) Slide 102 / 113
35 Slide 103 / 113 Classwork #6: Types of Energy Resources 87 What is the difference between renewable resources and non-renewable resources? Slide 104 / List two examples of a renewable energy resource. Slide 105 / 113
36 89 List two examples of a non-renewable energy resource. Slide 106 / Explain how one of the energy resources we talked about in class demonstrates the law of conversation of energy. Slide 107 / 113 Slide 108 / 113 Homework: Types of Energy Resources
37 91 Explain the role of a turbine in "creating" electrical energy. Slide 109 / How does a hydroelectric power plant transfer both potential and kinetic energy into electric energy? Slide 110 / What type of energy resource does not use a turbine to convert mechanical energy into electrical energy? Slide 111 / 113
38 94 Why are fossil fuels considered to be nonrenewable energy resources? Slide 112 / Why are fossil fuels not considered clean energy resources? Slide 113 / 113
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