1. A first-class lever has the

5. _____ is defined as the rate at which work is done.

A. Input force in the middle A. Power B. Fulcrum in the middle 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?

7. Lifting a car using a car jack is easier because it requires

A. A hand-held boat paddle

A. Less force

B. A screw

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

9. Levers are divided into _____ classes based on the location of the fulcrum and of the input and output forces.

13. _____ is a measure of the ability to do work. A. Power

A. Two B. three

10. A wedge is a modified

A. inclined plane

B. Energy

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.

B. lever A. mechanical B. non-mechanical

11. A ramp is a simple inclined plane that allows one to apply an input force _____ the output force.

15. The law of conservation of energy states that energy A. Is created from motion

A. Greater than

B. Cannot be created or destroyed

B. Less than

12. Which of the following is an example of a compound machine?

16. A system that receives energy from external sources is called

A. Scissors

A. Open

B. Ax blade

B. closed

17. _____ is the ratio of useful work output to work input.

21. What are the units of power?

A. Potential energy

A. Watts

B. Efficiency

B. Newton x meter

18. What are the units of work?

22. Which of the following is not a simple machine?

A. Newton x meter A. A lever B. watt B. A pair of scissors

19. A machine is a device that

23. Which of the following is not in the inclined plane family?

A. increases A. A ramp B. can multiply and change the direction of an input force.

20. The primary source of the sun’s energy is

B. A wheel and axle

24. Gravitational potential energy depends on

A. chemical energy A. speed B. nuclear fusion B. the height of the object.

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

A. Kinetic

B. kinetic energy

B. Potential

26. According to the first law of thermodynamics,

30. Which of the following is the name of a temperature scale? A. Newton

A. the total energy used in any process is conserved B. in any process there is a decrease in potential energy

27. The Fahrenheit temperature scale is defined by which of the following temperatures?

B. Kelvin

31. The temperature at which all molecular motion stops is A. 0°C.

A. Water boil at 212 and freezes at 32 degrees. B. Water boils at 100 and freezes at 0 degrees.

28. A cold-blooded reptile basks on a warm rock in the sun. Its body is warmed by

B. 0 K.

32. When one feels a warm oven, the sensation of warmth is the result of

A. Radiation and conduction A. energy transfer B. convection B. potential energy

33. The energy transferred between objects with different temperatures is

37. Solar panels gather _____ energy from the sun.

A. absolute zero A. kinetic B. heat 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

A. Decreases

B. Convection

B. Remains constant

35. _____ does not involve the movement of matter.

39. Which item below contains insulation material?

A. Conduction

A. Brass nail

B. Radiation

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

41. The total amount of energy (both usable and unusable) in any process A. Remains constant B. Varies

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.

43. The transfer of energy as heat caused by the collision of molecules is called

45. Energy from the sun reaches Earth by A. Conduction and radiation B. Radiation only

46. Convection currents rise in air because A. Hot air rises and cold air remains stagnant. B. Cool air descends and hot air rises.

47. Temperature is A. Measured with thermometers

A. Convection B. Conduction

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

B. Unchanging

48. The transfer of energy by the movement of fluids or gases with different temperatures is called A. Convection B. Conduction

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.