Slide 1 / 109 Slide 2 / 109 Energy of Objects in Motion Classwork and Homework www.njctl.org Slide 3 / 109 Classwork #1: Energy
Slide 4 / 109 1 Define Energy. Slide 5 / 109 2 What are the two things necessary for work to be done on an object? Slide 6 / 109 3 How can you determine the amount of work is being done on an object?
Slide 7 / 109 4 What would happen to an object’s velocity if positive work is done on an object? Slide 8 / 109 5 Based on the diagram below, is positive or negative work being done on the object? Explain. Slide 9 / 109 6 Based on the graph below, is positive or negative work being done on the object? Explain.
Slide 10 / 109 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? Slide 11 / 109 8 What are the two major forms of Energy? Slide 12 / 109 9 What is the definition of Mechanical Energy?
Slide 13 / 109 10 What is the definition of Non-Mechanical Energy? Slide 14 / 109 Homework: Energy Slide 15 / 109 11 What would happen to an object’s velocity if no work was being done on the object?
Slide 16 / 109 12 Based on the diagram below, is the object’s speed increasing or decreasing due to Air Resistance. Explain in terms of work being done on the object. Slide 17 / 109 13 Based on the graph below, which of the following is being done: positive work, negative work, no work. Explain. Slide 18 / 109 14 At what time on the graph below does the object start to experience negative work being done on it? Explain.
Slide 19 / 109 15 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 20 / 109 16 What are the two forms of Mechanical Energy? Slide 21 / 109 17 Name two forms of Non-Mechanical Energy.
Slide 22 / 109 Classwork #2: Kinetic Energy Slide 23 / 109 18 What two factors does Kinetic Energy depend upon? Slide 24 / 109 19 If an object is accelerating, how does its Kinetic Energy change?
Slide 25 / 109 20 If a mouse and an elephant have the same kinetic energy, can you determine which one is running faster? Explain. Slide 26 / 109 21 If an object’s speed is doubled, how does its Kinetic Energy change? Slide 27 / 109 22 If the mass of an object is doubled, how does its Kinetic Energy change?
Slide 28 / 109 23 How much kinetic energy does an 80 kg man have while running at 3 m/s? Slide 29 / 109 24 A 6 kg object has a speed of 20 m/s. What is its kinetic energy? Slide 30 / 109 25 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?
Slide 31 / 109 Homework: Kinetic Energy Slide 32 / 109 26 What is the SI unit for Kinetic Energy? Slide 33 / 109 27 When is the only time that an object has no Kinetic Energy?
Slide 34 / 109 28 If an object is decelerating, how does its Kinetic Energy change? Slide 35 / 109 29 If an object’s speed is cut in half, how does its Kinetic Energy change? Slide 36 / 109 30 If the mass of an object is cut in half, how does its Kinetic Energy change?
Slide 37 / 109 31 How much kinetic energy does a 4 kg cat have while running at 9 m/s? Slide 38 / 109 32 A 2 kg watermelon is dropped from a roof and is traveling with a speed of 5 m/s just before it hits the ground. How much Kinetic Energy does the watermelon have at this moment? Slide 39 / 109 33 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 40 / 109 Classwork #3: Gravitational Potential Energy Slide 41 / 109 34 What three factors does Gravitational Potential Energy depend upon? Slide 42 / 109 35 If an object is thrown up in the air, how does its Gravitational Potential Energy change?
Slide 43 / 109 36 If an object is falling, how does its Gravitational Potential Energy change? Slide 44 / 109 37 How does your Gravitational Potential Energy change if you are placed on the moon where gravity is lower than on Earth? Slide 45 / 109 38 If the mass of an object is cut in half, how does its Gravitational Potential Energy change?
Slide 46 / 109 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? Slide 47 / 109 40 A 200 kg boulder is sitting on top of a 10 m high hill. What is the boulder’s Gravitational Potential Energy? Slide 48 / 109 41 What is the gravitational potential energy of a 450 kg car at the top of a 25 m parking garage?
Slide 49 / 109 42 A 2.0 kg toy falls from 2 m to 1 m. What is the change in GPE? Slide 50 / 109 43 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? Slide 51 / 109 Homework: Gravitational Potential Energy
Slide 52 / 109 44 What is the SI unit for Gravitational Potential Energy? Slide 53 / 109 45 When is the only time that an object has no Gravitational Potential Energy? Slide 54 / 109 46 How does your Gravitational Potential Energy change if you are placed on Jupiter where gravity is larger than on Earth?
Slide 55 / 109 47 If the mass of an object is doubled, how does its Gravitational Potential Energy change? Slide 56 / 109 48 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? Slide 57 / 109 49 A placekicker in football is attempting a field goal and kicks a 0.75 kg football which hits the crossbar that is 3.1 m tall. How much Gravitational Potential Energy does the ball have when it hits the crossbar?
Slide 58 / 109 50 The “Green Monster” is the name for the left field wall at Fenway Park and is 11.33 m tall. How much Gravitational Potential Energy does a 0.2 kg baseball have when it just clears the wall? Slide 59 / 109 51 An 80 kg person falls 60 m off of a waterfall. What is her change in GPE? Slide 60 / 109 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?
Slide 61 / 109 Classwork #4: Elastic Potential Energy Slide 62 / 109 53 What two factors does Elastic Potential Energy depend upon? Slide 63 / 109 54 Define the term spring constant?
Slide 64 / 109 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 65 / 109 56 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 66 / 109 57 If a spring is stretched twice as far (as in #56), how many times larger is the Elastic Potential Energy that is stored in it?
Slide 67 / 109 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? Slide 68 / 109 59 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? Slide 69 / 109 60 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?
Slide 70 / 109 Homework: Elastic Potential Energy Slide 71 / 109 61 Define the term “Relaxed Length”. Slide 72 / 109 62 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 73 / 109 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 74 / 109 64 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? Slide 75 / 109 65 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?
Slide 76 / 109 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? Slide 77 / 109 Classwork #5: Conservation of Energy Slide 78 / 109 Questions 67 - 70 refer to the diagram below
Slide 79 / 109 67 At which position does the block have maximum Gravitational Potential Energy? Explain. Slide 80 / 109 68 At which position does the block have maximum Elastic Potential Energy? Explain. Slide 81 / 109 69 At which position does the block have maximum Kinetic Energy? Explain.
Slide 82 / 109 70 At which position does the block have maximum Total Energy? Explain. Slide 83 / 109 Questions 71 – 74 refer to the diagram below Slide 84 / 109 71 At which position does the man have maximum Gravitational Potential Energy? Explain.
Slide 85 / 109 72 At which position does the man have maximum Elastic Potential Energy? Explain. Slide 86 / 109 73 At which position does the man have maximum Kinetic Energy? Explain. Slide 87 / 109 74 At which position does the man have maximum Total Energy? Explain.
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