Podcast
Questions and Answers
Which of the following best describes the relationship between energy and work?
Which of the following best describes the relationship between energy and work?
- Work is the ability to do energy.
- Energy is the result of work being done.
- Work and energy are unrelated concepts.
- Energy is the ability to do work. (correct)
Gravitational potential energy depends on an object's mass, height, and gravitational strength.
Gravitational potential energy depends on an object's mass, height, and gravitational strength.
True (A)
Explain the difference between energy transfer and energy transformation, providing an example of each.
Explain the difference between energy transfer and energy transformation, providing an example of each.
Energy transfer is the movement of energy from one object or place to another without changing forms; for example, kicking a ball. Energy transformation is when energy changes from one type to another; for example, using a microwave to heat up food, electrical energy into thermal energy.
According to the law of ______________, energy cannot be created or destroyed.
According to the law of ______________, energy cannot be created or destroyed.
Match the energy type to its description:
Match the energy type to its description:
A 6kg textbook is sitting on a shelf that is 2 meters high. The gravitational strength is 9.8 N/kg. What is the gravitational potential energy of the textbook?
A 6kg textbook is sitting on a shelf that is 2 meters high. The gravitational strength is 9.8 N/kg. What is the gravitational potential energy of the textbook?
Efficiency is calculated by doing useful output divided by total input then times by 100.
Efficiency is calculated by doing useful output divided by total input then times by 100.
Explain what 'wasted energy' is, and provide an example.
Explain what 'wasted energy' is, and provide an example.
To calculate the cost of appliance use, you have to times energy used in kWh by cost of 1______________.
To calculate the cost of appliance use, you have to times energy used in kWh by cost of 1______________.
What type of energy transformation occurs in a car engine when fuel is burned?
What type of energy transformation occurs in a car engine when fuel is burned?
Flashcards
What is Energy?
What is Energy?
The ability to do work, measured in joules (J).
Potential Energy
Potential Energy
Energy stored in an object due to its position or condition.
Kinetic Energy
Kinetic Energy
Energy possessed by an object due to its motion.
Sound Energy
Sound Energy
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Thermal Energy
Thermal Energy
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Electrical Energy
Electrical Energy
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Elastic Energy
Elastic Energy
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Gravitational Potential Energy (GPE)
Gravitational Potential Energy (GPE)
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Chemical Energy
Chemical Energy
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Efficiency Calculation
Efficiency Calculation
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Study Notes
- Energy is the ability to do work.
- Work is done through energy transfer.
- Energy is measured in joules (J).
- Potential energy is energy stored in an object.
- Kinetic energy is energy due to movement.
- Potential energy is stored, while kinetic energy is in motion.
Types of Energy
- Sound energy is created by vibrations and travels through sound waves.
- Thermal energy is generated by the movement of heat particles.
- Magnetic energy causes pushing or pulling forces.
- Electrical energy involves electrons moving through wires.
- Mechanical energy is the energy of objects in motion.
- Elastic energy is stored when an object is pushed, pulled, or otherwise deformed.
- Gravitational Potential Energy (GPE) is stored when an object is above the Earth's surface.
- Chemical energy is stored in food and fuel.
- Nuclear energy is stored in the nucleus of an atom.
Calculating Gravitational Potential Energy (GPE)
- GPE is measured using height (in meters), mass (in kilograms), and gravitational strength (in newtons per kilogram).
- GPE = mass × height × gravitational strength
- Mass = GPE ÷ (gravitational strength × height)
- Height = GPE ÷ (gravitational strength × mass)
- Gravitational strength = GPE ÷ (mass × height)
Calculating Kinetic Energy
- The calculation of kinetic energy involves mass (kg) and speed/velocity (meters per second).
- Kinetic energy = 0.5 × mass × speed squared
Calculating Efficiency
- Efficiency = (useful output ÷ total input) × 100
- Wasted energy refers to energy changes that are not needed or wanted.
- Useful energy refers to energy changes that are desired.
Efficiency of Appliances
- 31.5 cents equals 1 kilowatt-hour (kWh).
- kWh is the unit of kilowatt-hour.
- Energy in kWh = power in kW × time in hours
- Cost = energy used in kWh × cost of 1 kWh
Energy Input and Output
- Energy input is the energy supplied to something to make it work; for example, fuel in a car providing chemical energy.
- Energy output is the energy that comes out after the input energy has been used; for example, a moving car possesses kinetic energy.
Energy Transformations
- Energy transformation is when one form of energy changes into another form of energy.
- Heating food in a microwave is an example of energy transformation.
Energy Transfers
- Energy transfer is energy that passes from one object or place to another without changing form.
- A person kicking a ball is an example of energy transfer.
- Energy transfer involves the movement of energy from one location to another, while energy transformation involves energy changing from one type to another.
Law of Conservation of Energy
- Energy cannot be created or destroyed; it can only be transferred or transformed.
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