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P.S- Unit 8
Energy and Heat Test Review
| Question | Answer |
|---|---|
| T/F In all cooling systems, energy is transferred as heat from one substance to another, leaving the first substance with less energy and with a lower temperature | True |
| T/F As the temperature of mercury inside the thermometer increases, its volume increases | True |
| T/F On the Fahrenheit scale, water freezes at -32F | False |
| T/F A degree on the Fahrenheit scale is a bigger unit than a degree on the Celsius scale | False |
| T/F Energy is transferred as heat between two objects of the same temperatures | False |
| T/F Energy is transferred as heat from a substance at high temperature to a substance at low temperature. | True |
| T/F Heating by convection can occur only through solids. | False |
| A hot object emits less radiation than a cool object emits | False |
| Radiation is the only method of energy transfer that can take place in a vacuum. | True |
| Some substances, when exposed to visible light, absorb more energy as heat than other substances absorb. | True |
| A good insulator is a poor conductor. | True |
| When a ball is through into the air, the potential energy gained must come from its kinetic energy. As the ball gains potential energy, its speed will: | Decrease |
| What forms of energy are present in a campfire? | Thermal, Radiant, and Chemical |
| What does it mean if an object is not doing work? | It is not moving |
| by burning a piece of wood, 35 Joules of chemical energy is released. 20 Joules becomes thermal energy; 5 joules becomes radiant energy. By the Law of Conservation of Energy, how much energy becomes mechanical energy of sound (the popping of the coals)? | 35-20-5= 10 joules |
| Compare a 100w motor and a 200 w motor. | The 200w motor does more Work |
| Ball #1 is rolled down the steeper side of a hill while ball #2 rolls down the opposite side which is less steep. Both balls roll out onto a flat surface at the same level. How do their speeds compare? | The speed will be the same for both balls because of Law of Conservation of Energy |
| An object originally at rest rolls down a hill, what kind of energy does it have at the top of the hill | Potential Energy |
| How does the moving energy of an object at the bottom of a hill compare with its resting energy at the top of the hill? | Both Kinetic and Potential Energies are the same |
| If an object has 200J of kinetic energy at the bottom of a hill, how much potential energy does it have half way down the hill? | 100J |
| Would steam have fast, slow, or medium moving molecules | fast |
| would ice have fast, slow, or medium moving molecules. | slow |
| would a liquid have fast, slow, or medium moving molecules | medium |
| An object at rest on the ground has what kind of energy? | No Energy because height is 0 meters |
| Temperature is? | associated with the sensation of hot and cold proportional to the average kinetic energy of molecules measured with thermometers |
| as the kinetic energy of the molecules in a substance increase, what happens? | The temperature of the substance increases also. |
| The transfer of energy caused by the collision of molecules is called | Conduction |
| the transfer of energy by the movement of fluids or gases with different temperatures is called? | Convection |
| energy from the sun reaches Earth by? | Radiation Only |
| Convection currents rise in air because | Cool air descends and hot air rises |
| which method of energy transfer does not involve movement of matter? | Radiation |
| which substance is the best conductor of transferring energy as heat between Carbon Dioxide, Water, Iron, or Rubber? | Iron |
| According to the first law of Thermodynamics | The total energy used in any process is conserved |
| What type of energy has moving electrons; or what comes out of a battery? | Electrical |
| The type of energy from a space heater | Thermal |
| the type of energy of splitting or fusing the atom | Nuclear |
| the type of energy we want from a light bulb | Radiant |
| the type of energy from molecular bonds, like in food | Chemical |
| the type of energy from moving objects or due to gravity | Mechanical |
| What term tells you how much energy is lost in an energy transfer | Efficiency |
| what is energy due to motion | Kinetic Energy |
| what is energy transferred by forces | Work |
| what is a mathematical expression of conservation of Energy | E(before)= E(after) |
| What is energy due to position | Potential Energy |
| what is the rate of doing work or using energy called | Power |
| What Conservation of Energy equation would represent a moving object that is slowed down? | Ek-W=EK |
| What Conservation of Energy equation would represent an object above the ground falling? | Ep=Ek |
| What Conservation of Energy equation would represent a moving object that comes to a stop | Ek-W= 0 |
| What Conservation of Energy equation would represent an object being lifted up? | 0+W= Ep |
| What Conservation of Energy equation would represent an object at rest being moved? | 0+W=Ek |
Created by:
jdgee
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