Energy All questions were copied from the UTIPPS Test Item Pool.

Transcription

1 Energy All questions were copied from the UTIPPS Test Item Pool. 1. The Law of Conservation of Energy states that energy cannot be created nor destroyed. Which of the following correctly restates this law for the box on the wooden ramp? A. The height of the ramp transforms into speed as the box slides down the ramp. B. No heat is generated or lost as the box slides down the ramp. C. The total amount of energy is the same at any point along the ramp. D. The gravitational potential energy of the box at the top is equal to its kinetic energy at the bottom.

2 2. A 5 kg box is at the top of a 2.7 m tall frictionless incline as shown in the diagram. It slides to the bottom of the incline, reaching a speed of 7.3 m/s. What is the box s kinetic energy at the bottom of the incline? A. 7.3 J B J C J D. 133 J

3 3. What is the type and amount of energy in a wrecking ball weighing 100 pounds suspended 100 feet above the ground? A. Accumulative energy of 1,000 lbs/ft B. Floatational energy of 1,000 lbs C. Kinetic energy of 5,000 ft. lbs D. Potential energy of 10,000 ft. lbs E. Weight energy of 10,000 lbs

4 4. A box is at the top of a frictionless incline as shown in the diagram. It slides to the bottom of the incline. Which equation below best shows the relationship expressing conservation of energy in this situation? A. B. C. D.

5 5. How does the production of electrical energy affect environmental issues directly related to human life? A. Creating a dam floods a canyon, displacing the residents. B. Central air conditioners can leak Freon if not properly maintained. C. Wood-burning stoves used to heat buildings pollute the air. D. Boy Scouts camping destroy the environment for other campers.

6 6. A box is at the top of a frictionless incline as shown in the diagram. It slides to the bottom of the incline. Which pair of charts below represents the transformation between kinetic and potential energy in this system? A. B. C. D.

7 7. A box is at the top of an incline as shown in the diagram. It slides to the bottom of the incline. The ramp is NOT frictionless. Which set of charts below represents the conservation of energy in this system? A. B. C. D.

8 8. A 5 kg box is at the top of a 2.7 m tall frictionless incline as shown in the diagram. It slides to the bottom of the incline, reaching a speed of 7.3 m/s. What is the total energy of this system? A. 7.3 J B J C J D. 133 J

9 9. A 5 kg box is at the top of a 2.7 m tall frictionless incline as shown in the diagram. It slides to the bottom of the incline, reaching a speed of 7.3 m/s. What type of potential energy does the box have at the top of the incline? A. Chemical B. Gravitational C. Electrostatic D. Elastic

10 10. A 5 kg box is at the top of a 2.7 m tall frictionless incline as shown in the diagram. The box is half way down the incline. Which statement best describes the energy of the box. A. The box has all Potential Energy. B. The box has all Kinetic Energy. C. The box has the difference between the Potential Energy and the Kinetic Energy. D. The box has the sum of the Potential Energy and the Kinetic Energy.

11 11. Which statement below accurately describes an energy transformation used by people to improve human life? A. All of the chemical potential energy of the gasoline used by a car is converted to kinetic energy. B. The electrical potential energy possessed by the water in a river is converted to the kinetic energy of the water C. The gravitational potential energy possessed by the water behind a dam is converted to electrical energy D. The kinetic energy of a train is converted to heat as the train stops to take on more cars

12 13. At a hydroelectric dam, the head engineer calculates that there are 7,291,346 joules of gravitational potential energy available in the water stored behind the dam. A technician at the dam measures the electrical energy output to be 2,861,039 Joules. Which statement is best supported by this evidence? A. Useful energy is lost in the energy transformations within the dam s power plant. B. The power plant is functioning at a very low efficiency and should be abandoned. C. The dam is harming wildlife habitat and a committee should evaluate the damage. D. The power plant transforms mechanical to electrical energy and transmits it to people.

13 14. What is the type and amount of energy in a wrecking ball weighing 100 pounds suspended 100 feet above the ground? A. Accumulative energy of 1,000 lbs/ft B. Floatation energy of 1,000 lbs C. Kinetic energy of 5,000 ft. lbs D. Potential energy of 10,000 ft. lbs E. Weight energy of 10,000 lbs

14 15. How could you increase the potential energy of the water in the tower? A. Increase the height of the tower. B. Increase the pipe s diameter. C. Increase the number of filters in the water tank. D. Increase the valve opening at the end of the pipe.

15 16. The law of conservation of energy implies that: A. Potential and Kinetic energy are always completely changed to useful work. B. The total energy of a system remains constant, if all forms of energy are considered. C. Losses do not occur when energy is converted from one form to another. D. All heat energy is wasted. 17. A young girl is swinging in a backyard swing. As she moves through the lowest point of her swing, she has reached her A. none of these B. minimum KE C. maximum PE D. maximum KE

16 18. The gasoline in a car s gas tank contains 1,350,000 J of chemical potential energy. The car s engine converts this to 450,000 J of kinetic energy as the car travels down the road. How much energy is apparently lost? A. 450,000 J B. 900,000 J C. 1,350,000 J D. 1,800,000 J

17 19. The gasoline in a car s gas tank contains 1,350,000 J of chemical potential energy. The car s engine converts this to 450,000 J of kinetic energy as the car travels down the road. Which statement below is the best inference that can be drawn from this data about the apparent loss of useful energy? A. The gasoline does not burn completely in the engine and as a result generates excess heat. B. The driver revs the engine, races, and slams on the brakes too often. C. Burning fuel and friction between moving parts generate a lot of heat. D. There is a great deal of friction between the tires and the road generating heat