Physics O1: Energy and Conservation of Energy 1. Energy cannot be a. observed directly. b.transferred. c. transformed. d. conserved. 2. A bouncing ball has a. mechanical kinetic energy. b. thermal kinetic energy. c. gravitational potential energy. d. all of the above. 3. Sound energy travels as a. an electromagnetic wave. b. a pressure wave. c. a water wave. d. a transverse wave. 4. When a baseball is struck with a baseball bat, some mechanical kinetic energy is transformed into a. sound energy, chemical potential energy, and thermal energy. b. elastic potential energy.sound energy, and thermal energy. c. electrical energy, sound energy, and chemical potential energy. d. elastic potential energy, electrical energy, and thermal energy. 5. A cyclist converts chemical potential energy into to move a bicycle This transformation also produces other forms of energy such as a. elastic potential energy.sound energy b. sound energy, mechanical kinetic energy c. mechanical kinetic energy thermal energy d. mechanical kinetic energy, electric kinetic energy 6. A soccer player kicks a ball. Consider the system of the player and ball (together), in this process energy is: i) transferred, ii) transformed,iii) conserved, iv) lost. Which of the following is the most correct answer for the energy changes of the system? a. transferred and conserved. b. transferred, transformed, and lost. c. transformed and lost. d. transferred and transformed 7. The amount of gravitational potential energy an object has depends on the mass of an object,the acceleration due to gravity, and a. the velocity of the object. b. the height of the object. c. the type of object. d. the energy of the object.

Question

Question

Physics O1: Energy and Conservation of Energy 1. Energy cannot be a. observed directly. b.transferred. c. transformed. d. conserved. 2. A bouncing ball has a. mechanical kinetic energy. b. thermal kinetic energy. c. gravitational potential energy. d. all of the above. 3. Sound energy travels as a. an electromagnetic wave. b. a pressure wave. c. a water wave. d. a transverse wave. 4. When a baseball is struck with a baseball bat, some mechanical kinetic energy is transformed into a. sound energy, chemical potential energy, and thermal energy. b. elastic potential energy.sound energy, and thermal energy. c. electrical energy, sound energy, and chemical potential energy. d. elastic potential energy, electrical energy, and thermal energy. 5. A cyclist converts chemical potential energy into to move a bicycle This transformation also produces other forms of energy such as a. elastic potential energy.sound energy b. sound energy, mechanical kinetic energy c. mechanical kinetic energy thermal energy d. mechanical kinetic energy, electric kinetic energy 6. A soccer player kicks a ball. Consider the system of the player and ball (together), in this process energy is: i) transferred, ii) transformed,iii) conserved, iv) lost. Which of the following is the most correct answer for the energy changes of the system? a. transferred and conserved. b. transferred, transformed, and lost. c. transformed and lost. d. transferred and transformed 7. The amount of gravitational potential energy an object has depends on the mass of an object,the acceleration due to gravity, and a. the velocity of the object. b. the height of the object. c. the type of object. d. the energy of the object.

Answer 1

1. **a. observed directly.** We observe the *effects* of energy, like motion or heat, but not energy itself. 2. **d. all of the above.** A bouncing ball has kinetic energy due to its motion (mechanical), kinetic energy at the molecular level contributing to its temperature (thermal), and potential energy due to its position above the ground (gravitational). 3. **b. a pressure wave.** Sound travels through a medium (like air) by compressing and expanding the particles of the medium, creating a pressure wave. 4. **b. elastic potential energy, sound energy, and thermal energy.** When the bat hits the ball, the ball deforms briefly, storing elastic potential energy. Some energy is converted to sound, and some is lost as heat (thermal energy) due to friction. 5. **c. mechanical kinetic energy, thermal energy.** The cyclist's body converts chemical energy (from food) into kinetic energy to move the bike. Some energy is also lost as heat (thermal energy) due to friction and bodily processes. 6. **a. transferred and conserved.** Within the system of the player and the ball, energy is transferred from the player to the ball. Assuming no external forces (like air resistance), the total energy of the system is conserved. 7. **b. the height of the object.** Gravitational potential energy is given by the formula PE = mgh, where m is mass, g is acceleration due to gravity, and h is height.

Question

Solution

Answer