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Differentiate between gravitational potential energy and kinetic energy. A:
20. Define mechanical energy. A:
21. What does friction do the kinetic energy and potential energy? A:
22. Describe how energy is transformed from one form to another as a roller coaster goes from the start to the end of the ride. A:
Chemical energy
23. Describe the relationship between chemical energy, potential energy and fire. A:
24. Describe how coal is used to generate electricity. A:
Energy Transfer
25. Explain how the northern lights form in terms of energy transfer. A:
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1–2. Differentiate between gravitational potential energy and kinetic energy.
- Gravitational potential energy (GPE): energy an object has because of its position in a gravitational field. For near-Earth situations, GPE = mgh (mass × gravity × height). It is stored energy that can become motion if the object falls.
- Kinetic energy (KE): energy an object has because of its motion. KE = 1/2 mv^2 (half mass times speed squared). Faster or more massive objects have more KE.
- Key differences: GPE depends on height/position, KE depends on speed; GPE is “stored” potential energy, KE is active energy of motion. Energy can convert between the two (e.g., falling object).
20. Define mechanical energy.
- Mechanical energy = the sum of kinetic energy and potential energy in a system (commonly KE + gravitational PE; can include elastic PE). It is the energy associated with the motion and position/configuration of macroscopic objects.
21. What does friction do to the kinetic energy and potential energy?
- Friction (and other non-conservative forces like air resistance) converts mechanical energy (KE and PE) into internal energy (mainly thermal energy) and sometimes sound. It reduces the total mechanical energy available: friction does negative work on moving objects, decreasing KE directly and causing systems to lose PE as they do work against friction. The “lost” mechanical energy appears as heat in the objects and surroundings.
22. Describe how energy is transformed from one form to another as a roller coaster goes from the start to the end of the ride.
- At the start, a lift (chain or launch) supplies work and raises the cars, increasing gravitational potential energy.
- As the coaster descends, GPE converts into kinetic energy and the cars speed up.
- On climbs, loops and turns, kinetic energy converts back into GPE (slowing the cars) or into centripetal motion; energy continuously shifts between KE and PE.
- Friction and air resistance convert part of the mechanical energy into thermal energy and sound, so the total mechanical energy decreases over the ride unless external work is added (brakes, lift hills, boost).
- At the end, brakes remove remaining KE, converting it mostly into heat, and the coaster comes to rest.
Chemical energy
23. Describe the relationship between chemical energy, potential energy and fire.
- Chemical energy is a form of potential energy stored in the arrangement of atoms and chemical bonds. During combustion (fire), chemical potential energy is released when bonds are broken and new bonds form; that energy is converted into thermal energy (heat), light, and chemical reaction products (e.g., CO2, H2O). So fire is the visible/thermal release of chemical potential energy.
24. Describe how coal is used to generate electricity.
- Burning: Coal is combusted in a boiler, releasing chemical energy as heat.
- Steam production: Heat converts water into high-pressure steam.
- Turbine: Steam expands through and spins a turbine, converting thermal energy to mechanical (rotational) energy.
- Generator: The turbine drives an electrical generator; rotating coils in a magnetic field induce electric current, converting mechanical energy to electrical energy.
- Condensation and recycling: Steam is condensed back to water and returned to the boiler.
- Losses/emissions: Some energy is lost as waste heat; combustion produces emissions (CO2, particulates, SOx, NOx) and ash that must be managed.
Energy Transfer
25. Explain how the northern lights form in terms of energy transfer.
- Charged particles (mainly electrons and protons) from the solar wind are accelerated toward Earth and guided by the planet’s magnetic field toward high latitudes.
- These energetic particles collide with atoms and molecules in Earth’s upper atmosphere, transferring kinetic energy to the atmospheric particles.
- The collisions excite electrons in atmospheric atoms/molecules to higher energy states; when those electrons relax back to lower states, they emit photons (light).
- Different gases and excitation energies produce different colors (oxygen → green/red; nitrogen → blue/purple). The process converts kinetic energy of incoming particles into electromagnetic energy (visible light) and heat/ionization in the atmosphere.
- Gravitational potential energy (GPE): energy an object has because of its position in a gravitational field. For near-Earth situations, GPE = mgh (mass × gravity × height). It is stored energy that can become motion if the object falls.
- Kinetic energy (KE): energy an object has because of its motion. KE = 1/2 mv^2 (half mass times speed squared). Faster or more massive objects have more KE.
- Key differences: GPE depends on height/position, KE depends on speed; GPE is “stored” potential energy, KE is active energy of motion. Energy can convert between the two (e.g., falling object).
20. Define mechanical energy.
- Mechanical energy = the sum of kinetic energy and potential energy in a system (commonly KE + gravitational PE; can include elastic PE). It is the energy associated with the motion and position/configuration of macroscopic objects.
21. What does friction do to the kinetic energy and potential energy?
- Friction (and other non-conservative forces like air resistance) converts mechanical energy (KE and PE) into internal energy (mainly thermal energy) and sometimes sound. It reduces the total mechanical energy available: friction does negative work on moving objects, decreasing KE directly and causing systems to lose PE as they do work against friction. The “lost” mechanical energy appears as heat in the objects and surroundings.
22. Describe how energy is transformed from one form to another as a roller coaster goes from the start to the end of the ride.
- At the start, a lift (chain or launch) supplies work and raises the cars, increasing gravitational potential energy.
- As the coaster descends, GPE converts into kinetic energy and the cars speed up.
- On climbs, loops and turns, kinetic energy converts back into GPE (slowing the cars) or into centripetal motion; energy continuously shifts between KE and PE.
- Friction and air resistance convert part of the mechanical energy into thermal energy and sound, so the total mechanical energy decreases over the ride unless external work is added (brakes, lift hills, boost).
- At the end, brakes remove remaining KE, converting it mostly into heat, and the coaster comes to rest.
Chemical energy
23. Describe the relationship between chemical energy, potential energy and fire.
- Chemical energy is a form of potential energy stored in the arrangement of atoms and chemical bonds. During combustion (fire), chemical potential energy is released when bonds are broken and new bonds form; that energy is converted into thermal energy (heat), light, and chemical reaction products (e.g., CO2, H2O). So fire is the visible/thermal release of chemical potential energy.
24. Describe how coal is used to generate electricity.
- Burning: Coal is combusted in a boiler, releasing chemical energy as heat.
- Steam production: Heat converts water into high-pressure steam.
- Turbine: Steam expands through and spins a turbine, converting thermal energy to mechanical (rotational) energy.
- Generator: The turbine drives an electrical generator; rotating coils in a magnetic field induce electric current, converting mechanical energy to electrical energy.
- Condensation and recycling: Steam is condensed back to water and returned to the boiler.
- Losses/emissions: Some energy is lost as waste heat; combustion produces emissions (CO2, particulates, SOx, NOx) and ash that must be managed.
Energy Transfer
25. Explain how the northern lights form in terms of energy transfer.
- Charged particles (mainly electrons and protons) from the solar wind are accelerated toward Earth and guided by the planet’s magnetic field toward high latitudes.
- These energetic particles collide with atoms and molecules in Earth’s upper atmosphere, transferring kinetic energy to the atmospheric particles.
- The collisions excite electrons in atmospheric atoms/molecules to higher energy states; when those electrons relax back to lower states, they emit photons (light).
- Different gases and excitation energies produce different colors (oxygen → green/red; nitrogen → blue/purple). The process converts kinetic energy of incoming particles into electromagnetic energy (visible light) and heat/ionization in the atmosphere.
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