In your textbook, read about kinetic energy. Circle the ietter of the choice that best compietes the statement or answers the question. 7. 10. 11. 12. 13. 14. 15 Which of the following would produce the greatest increase in the kinetic energy from an objects motion? a. doubling its mass c. halving its mass b. doubling its velocity cl. halving its velocity A baseball and a ping pong ball are both shot from a slingshot with equal velocity. Which object has the greater kinetic energy from this motion? a. the baseball c. The answer depends on the launch angle. b. the ping pong ball d. The kinetic energies are equal. A diver doing a somersault has a greater angular velocity in the ___ a. tuck position c. The answer depends on the height of the diver. b. fully extended position d. The velocities are equal. How does the kinetic energy from the forward motion of a car traveling at 16 m/s compare with the kinetic energy of the same car traveling at 8 m/s? a. It is 2 times greater. c. It is 8 times greater. b. It is 4 times greater. cl. It is 16 times greater. How much work would have to be done on a truck with a kinetic energy of 2 x 104] from its forward motion to reduce its kinetic energy by half? a. 1x1021 c. 1x104] b. 4x104J d. 2x102] A car has a kinetic energy ofo from its forward motion. 7.5 s later it moves in the opposite direction with the same speed. How much kinetic energy does the car have from this backward motion? a. xJ c. 0] b. x] d. 2x] A car has a kinetic energy of xJ. 7.5 5 later it moves in the opposite direction with 3 times its initial speed. What kinetic energy does it have? a. x] c. 9x] b. 3x] d. xJ A 6 kg ball is traveling at 5 m/s. What is its translational kinetic energy? a. 37.5] c. 150] b. 751 d. 300] . lfthe velocity of the ball in question 14 doubles, its translational kinetic energy will be _ a. 37.5] c. ISDJ b. 75] d. 300] Chapter 11 . Energy and Its Conservaon SECTION 1 The Many Forms of Energy In your textbook, read about modeling the work-energy theorem. The diagram shows changes to your money during a week. Circle the choice that best completes the statement or answers the question. 50 1. You began Monday with $25. How much money did you have by the 40 wage end of the day on Monday? 30 pay for lawn work a. $35 c. $20 20 b. $25 d. $0 allowance Earning and Spending ($) 10 2. How much money did you have by 0 the end of the day on Wednesday? -10 lunch a. $25 $55 cost of CD -20 cost of b. $35 d. $65 cost of clothes movies/dinner -30 3. How much money did you have by Mon Tue Wed Thu Fri Sat Sun the end of the day on Friday? Day a. $25 C. $45 b. $35 d. $60 4. How does the amount of money you had at the end of the day on Sunday compare with the amount you had at the beginning of the week? a. It increased. b. It decreased c. It remained unchanged. Read the following situations and draw before-and-after energy diagrams in the space provided. 5. A loaded wheelbarrow has a kinetic energy 6. A loaded wheelbarrow has a kinetic energy of 50 J from its motion. You do 30 J of work of 70 J from its motion. You do -60 J of on the wheelbarrow energy on the wheelbarrow. Before After Before After +100 +100 +100 +100 +80 +80 +80 +80 +60 +60 +60 +60 +40 +40 +40 +40 Energy (J) Energy (J) Energy () Energy (J) +20 +20 +20 +20 0 -20 -20 -20 -20 -40 -40 -40 -40 -60 -60 -60 -60 Chapter 11 . Energy and Its ConservationENERGY AND ITS CONSERVATION Vocabulary Review Write the term that correctly completes the statement. Use each term once. elastic collision elastic potential energy gravitational potential energy inelastic collision law of conservation of energy mechanical energy reference level rotational kinetic energy thermal energy Within a closed, isolated system, energy can change form, but the total amount of energy is constant. This is a statement of the The position at which the potential energy is defined to be zero is a(n) . The sum of the kinetic and potential energy of a system is the of the system. The stored energy of an Earth-object system as a result of gravitational attraction between the object and Earth is A collision in which kinetic energy is converted to other forms is a(n) _. Energy that depends on an object's moment of inertia and its angular velocity is The sum of the kinetic energy and potential energy of an object's particles is . A collision in which the kinetic energy doesn't change is a(n) The energy of a compressed spring or a stretched rubber band is