5. is defined as the rate at which work is done.
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1 1. A first-class lever has the A. Input force in the middle B. Fulcrum in the middle 5. is defined as the rate at which work is done. A. Power B. Joule 2. A wheelbarrow is an example of a A. First class lever B. Second-class lever 6. A ramp is a that decreases the force required to move an object while increasing the distance the object travels. A. Newton B. Machine 3. Which of the following is an example of a third-class lever? A. A hand-held boat paddle B. A screw 7. Lifting a car using a car jack is easier because it requires A. Less force B. Less work 4. The transfer of energy to a body by the application of a force that causes the body to move in the direction of the force is called A. Power B. Work 8. What are the two families of simple machines? A. Inclined plane and lever B. Pulley and screw
2 9. Levers are divided into classes based on the location of the fulcrum and of the input and output forces. A. Two B. three 13. is a measure of the ability to do work. A. Power B. Energy 10. A wedge is a modified A. inclined plane B. lever 14. When a pitcher throws a softball to a catcher, the vibration of the atoms that make up the softball is non-mechanical energy, while the motion of the ball toward the catcher is energy. A. mechanical B. non-mechanical 11. A ramp is a simple inclined plane that allows one to apply an input force the output force. A. Greater than 15. The law of conservation of energy states that energy A. Is created from motion B. Cannot be created or destroyed B. Less than 12. Which of the following is an example of a compound machine? A. Scissors B. Ax blade 16. A system that receives energy from external sources is called A. Open B. closed
3 17. is the ratio of useful work output to work input. A. Potential energy B. Efficiency 21. What are the units of power? A. Watts B. Newton x meter 18. What are the units of work? A. Newton x meter B. watt 22. Which of the following is not a simple machine? A. A lever B. A pair of scissors 19. A machine is a device that A. increases B. can multiply and change the direction of an input force. 23. Which of the following is not in the inclined plane family? A. A ramp B. A wheel and axle 20. The primary source of the sun s energy is A. chemical energy B. nuclear fusion 24. Gravitational potential energy depends on A. speed B. the height of the object.
4 25. The kind of energy associated with atomic bonds is 29. Temperature is a measure of the average energy of an object s particles. A. chemical energy B. kinetic energy A. Kinetic B. Potential 26. According to the first law of thermodynamics, A. the total energy used in any process is conserved B. in any process there is a decrease in potential energy 30. Which of the following is the name of a temperature scale? A. Newton B. Kelvin 27. The Fahrenheit temperature scale is defined by which of the following temperatures? A. Water boil at 212 and freezes at 32 degrees. B. Water boils at 100 and freezes at 0 degrees. 31. The temperature at which all molecular motion stops is A. 0 C. B. 0 K. 28. A cold-blooded reptile basks on a warm rock in the sun. Its body is warmed by A. Radiation and conduction B. convection 32. When one feels a warm oven, the sensation of warmth is the result of A. energy transfer B. potential energy
5 33. The energy transferred between objects with different temperatures is A. absolute zero B. heat 37. Solar panels gather energy from the sun. A. kinetic B. radiated 34. describes how much energy is required to raise an object s temperature. 38. When energy is transformed, the amount of usable energy A. Specific heat B. Convection A. Decreases B. Remains constant 35. does not involve the movement of matter. A. Conduction B. Radiation 39. Which item below contains insulation material? A. Brass nail B. Plastic foam cup 36. Heat always moves from an object of higher temperature to an object of temperature. A. Moderate B. Lower 40. Evaporation causes a effect. A. Cooling B. Heating
6 41. The total amount of energy (both usable and unusable) in any process A. Remains constant B. Varies 45. Energy from the sun reaches Earth by A. Conduction and radiation B. Radiation only 42. As the kinetic energy of the molecules in a substance increases, the A. Temperature of the substances increases. B. Temperature of the substance decreases. 46. Convection currents rise in air because A. Hot air rises and cold air remains stagnant. B. Cool air descends and hot air rises. 43. The transfer of energy as heat caused by the collision of molecules is called A. Convection B. Conduction 47. Temperature is A. Measured with thermometers B. Unchanging 44. In an air conditioner, a substance that easily evaporates and condenses is used to transfer energy from a room to the air outside. When the substance evaporates, A. It absorbs energy as heat from the surrounding air. B. Energy is transferred by conduction 48. The transfer of energy by the movement of fluids or gases with different temperatures is called A. Convection B. Conduction
7 49. Which method of energy transfer does not involve movement of matter? A. Radiation B. Conduction 50. Which of the following statements is true? A. Energy as heat is transferred from a lower temperature to a higher temperature. B. The amount of heat in a closed system is a constant.
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